The one thing I want to complain about when talking about vi and vim is this one: commands are affected by caps lock state, and this is a serious pain to me, since I use that key for it's purpose: generate text in MAJUSCULE, notably that good old C/C++ idiom that reserves those for macros, or for shell variable.
Semantics is important, but then, using caps lock also modifies the behavior of commands!

I would like, and have been tempted to write, a vi-clone that would act like a game: caps-lock understood for text input, but ignored for commands.