Ability to resolve a tap as a hold.

[voronind-com]

Basically I want to have a layer that holds a key on first tap and releases it on second tap.
This could be useful for games that require you to hold a key for a long time i.e. to craft something, this way there's no need to hold a key, just tap it and it'll be held all the time.

I know we can use toggle(shift) for that, but it doesn't work for normal keys like toggle(e).