How about using input quantize (deselect event start times and select note durations) when recording the chords? That will make the edit a little easier, I think.
There seems to be no way of enabling/disabling input quantize of all MIDI tracks at once, but there's a global input quantize setting page (simply named "Input Quantize" but not the one you can select from the input quantize pull-down of each track). I don't know how to open it without using a shortcut key, though. The command is called "Launch MIDI Input Quantize Settings" and no keys are assigned by default.
Hope this helps. But someone else might know a better way.
Edit: Actually, this doesn't make the edit easier at all, does it? lol...hmm...maybe you should input quantize everything, including the event start times.