Not a big deal, but it wouldn't seem hard to implement:
 
Select All -- MIDI 
Select All -- Audio
Select All -- VST  etc.  
 
Select all midi is the one I most often want: i have to use select all, then scroll down to the audio tracks, and deselect them, in order to bounce all midi to clips (which has been necessary in big projects since forever, because a very large number of midi clips ends up with bad behavior in the screens).