industry standard keymap: threatens a single editmode combo:
No more crazy Ctrl+Shift+Alt combos.
also industry standard keymap: contain double keys+double LMB click combos for relevant modeling actions:
I like the idea of selecting collections (we made a Select-up tool to grow a selection to the entire collection and further to the levels of hierarchical branches, also tools for isolating and hiding collections of selected objects for - and = buttons) but not for double click.
Double clicks and double taps (timing actions), pressholding, precise aimings, threshold-delimited actions belong to the group of speed killers.