You should create a new thread if it is a different subject. otherwise it turns into your personal help list, and ends up confusing those who search for answers to their issues about mapped keys, which this is.
Anyway, the answer is yes.
Create a Mapped Key (you can use the Mapped Key Wizard for this). You want a straight Broadcast Mapped Key from the sounds of it.
This way, when you press F all clients will get it. If you want to use F by itself on your main, then choose a Key Remap, so you can press ALT F (or similar) and this will send F to all clients.
Further info
http://isboxer.com/wiki/Mapped_Key