Please read previous pages, some functions were already discussed (e.g. branch view). Also please read suggestions topic mentioned in first post - it already has some suggestions to TC that can't be supported by Virtual Panel directly (I've added now some of them to that suggestions list) - but only Mr. Ghisler knows if and when theese features will be realized.
What exactly do you mean by 'inclusion/exclusion of specific directories' in Find Files dialog?
Shift+F4 TC processes internally also - I can't do something so you need to create suggestion topic if you wish to see it implemented. Shift+F4 in folder-link I already mentioned in VP suggestions topic but you want some another feature. I think it will be simpler to use some external tool that will accept filename and ask to create new file in same folder.
BTW, file comments are supported, you just need to create custom view with column [=tc.comment] (default 'comments' view not working in virtual panel) - it is mentioned in Readme.txt file.
About right-click command to copy full path - I have no such command even in normal folders.

As you see, TC doesn't support shell extensions in virtual folders. But you may add internal association to external program that will copy passed path, or you may add internal TC command that will pass
%P%N and copy it to clipboard - last TC versions expand virtual path to physical in
%P%N.