Change NOR -> SEL while a modifier is pressed

[dstrelnikov]

Would that be possible to assign a modifier (for instance Alt) to switch the normal mode (NOR) to select / extend mode SEL mode while the modifier is being hold?

Something like v2wv = Mod(hold) 2w Mod(release).

[archseer]

This is impossible to do in the terminal because we only get press events (+ repeated events on hold), no release/hold events.