A little video showing how the PRV controller pane eats up my hours, a few seconds at a time.  
 
https://www.youtube.com/watch?v=T66WaIOF6_o
 
Does it make me angry every single day?  Yes indeed.   It is so unnecessarily bad.    So incredibly difficult to put in controller values where you want them.    Do I want it improved?  YES YES YES. 
 
In this video:   first part is trying to draw a controller and avoid being caught by the horizontal line.    Then, trying to use Alt-Click to draw a single controller value.   Get to close to the horizontal line, just as you are about to click, and the tool changes to Erase -- so you've erased a value potentially a long way away.    Don't notice you did it?  You'll be very sorry.     Then your lost seconds will become hours as you try to figure out why things changed. 

When I need to do super-precise controller drawing, which can even approach a spline-based sort of "vector graphics" approach, I use the track view PRV. Resolution is limited only by the size of your screen. I use the two PRVs for what they do best.
 
Also note that if you've done most of your work in the dockable PRV, you can convert that to an envelope in the track view PRV with Clips > Convert MIDI Controllers to Envelopes...very convenient when you've done a "quick and dirty" job in the PRV to keep the flow going, but then need to transition into a heavy editing mode.
 

I second the idea of converting CCs to automation envelopes. They provide excellent editing control. I usually record CCs from a control surface and convert to automation for editing.

You can also make the controller lanes larger and taller for easier editing.

Or display them in the PRV note window (instead of in their own little controller lanes); that window can be plenty large. 
 
"Get to close to the horizontal line, just as you are about to click, and the tool changes to Erase -- so you've erased a value potentially a long way away."
 
I don't think you have to worry about that - if you ALT+CLICK, you will only erase one controller value (at least on my machine), not anything "potentially a long way away".  It may kind of appear like you're erasing values down the line if you happen to click on the last controller value in the clip, but then, by definition there is nothing down the line if its the last controller value.  Oh, and by the way, if you switch to the freehand tool (F9), you won't get the "close to the line" problem.
 
To me, entering PRV controllers is not that bad.  Not ideal, but plenty good enough.  And there's good alternatives above.
 
Good luck!

PeteL
Or display them in the PRV note window (instead of in their own little controller lanes); that window can be plenty large. 
 
"Get to close to the horizontal line, just as you are about to click, and the tool changes to Erase -- so you've erased a value potentially a long way away."
 
I don't think you have to worry about that - if you ALT+CLICK, you will only erase one controller value (at least on my machine), not anything "potentially a long way away".  It may kind of appear like you're erasing values down the line if you happen to click on the last controller value in the clip, but then, by definition there is nothing down the line if its the last controller value.  Oh, and by the way, if you switch to the freehand tool (F9), you won't get the "close to the line" problem.
 
To me, entering PRV controllers is not that bad.  Not ideal, but plenty good enough.  And there's good alternatives above.
 
Good luck!

Good points all the way. I have never had trouble working in the PRV. Now that CW has made the zoom in bigger and fixed some small things I find it as as any around to work with.

Huh...  I'll have to try that F9 option!   

John
You can also make the controller lanes larger and taller for easier editing.

But only to a max of a bit more than 2" (5cm) which isn't enough for some (Keni comes to mind).
 
Good to (re)discover that an automation lane can be shown in the track and then zoomed as large as one needs.

Anderton
you can convert that to an envelope in the track view PRV with Clips > Convert MIDI Controllers to Envelopes

Right there is my 'new function just learned' of the week - a million thanks!
 
While we are on this topic - could you do  a Friday Tip on how to easily identify the correct controller CC to automate when selecting from the 'automation' pick lists?   The naming conventions aren't clear (outside of volume, pan etc) so I end up trying them one at a time until I see the right control move.

Wood67

Anderton
you can convert that to an envelope in the track view PRV with Clips > Convert MIDI Controllers to Envelopes

Right there is my 'new function just learned' of the week - a million thanks!
 
While we are on this topic - could you do  a Friday Tip on how to easily identify the correct controller CC to automate when selecting from the 'automation' pick lists?   The naming conventions aren't clear (outside of volume, pan etc) so I end up trying them one at a time until I see the right control move.

Can you give me an example? I assume you're not talking VST automation controllers for soft synths because they're usually named?