I do not can use bow

This is the bug tracker, please suggest features on the [Minecraft Suggestions subreddit|reddit.com/r/minecraftsuggestions]. Additionally, I don't know if this would help your problem, but the keys can be changed in the Controls menu.

Exactly.

Also, this is already implemented. Use the sneak key (Shift by default) to not activate the fence gate but use your item instead.