In some cases it very useful and helps a lot to remember the hotkeys.

For example: just one key for three vertical align.

alt-a - align center, alt-a twice - align left, alt-a thrice - align right.


Another case:

d - copy, dd - arraydir, ddd - arraycircular, dddd - arraycurve
I think 4-tap hotkey is too much, but 1..3 is good enough.

All my multitap hotkeys for now: