Pro 18.104.22.168 user on Mac and PC (and love the fact that it's cross-platform identical) -
I think the mt (modify text) keyboard command shortcut is broken on both mac and pc versions (haven't checked linux) - as in, it returns "Command 'mt' not found" - a bit annoying when I'm starting to get pretty good at the left-hand keyboard, right-hand mouse combos for QCAD speed!
also a Mac bug with scrolling for zoom - if you mouse-wheel scroll up (or down) the block browser (if docked) until it runs out of scroll room, it starts zooming the document - you need to click on a newly-opened doc before it'll start doing it but from that moment on. - quite annoying...
Length - it would be great to have a "length" parameter for lines that could be seen (and edited) - once they're off horizontal or vertical it's a pain to measure things or work out how (much) to modify them by.
I'll think of some more ..
I do think the convention of right-click for "meta" (of the object clicked-on) is pretty well-established - could it be an option please? (I didn't even realise right-click did the same as Esc)