I presume you've looked at the list of keyboard shortcuts in AE Help, so you must be aware that there are a boatload of them, and pretty much EVERY easy keyboard shortcut combination has been used: how about the obscure, illogical, hard-to-remember ones? There are quite a few: perhaps something like CTL-SHIFT-ALT-] would do the trick.
But instead of just crabbing about it in a forum, try submitting a feature request:
I was under the assumption that this was a feature request thread! And I realize that there are A LOT of key commands. I would gladly trade any of them for just dropping a keyframe. No need to get snippy
and I am sure you could free up some already taken key commands for dropping keyframes and condensing them in to one.
No need to get snippy
Oh, you thought that kind & gentle admonition was snippy?
I can't wait to read your reaction should you fall under the tender minsitrations of the good Herr Mylenium (who does not suffer silly questions well, not that you would ever ask one) or when I am personally In A Mood.
And as to your suggestion to drop the shortcuts that you personally find irrelevant:
just because you don't think they're worth it doesn't mean that someone else -- who may use AE for purposes very different than yours -- doesn't find them to be a Godsend. Walk a mile in another man's moccasins.