hold c and then right click. it will bring up a different emote menu, that will have an option to ask for the ammo your current gun requires.
click with 2 fingers, or go to settings and find your trackpad settings and change those. i hope this helps!
i would like to thank you for suggesting these features to the developers. i don't know if you influenced them in adding 2 and 3, but 1 also seems like an amazing idea!