Is it possible to get AHK to hold them keys like F1?
Yes, it's possible.

The hotkey is written correctly. Something else is causing the problem. If you want help with this you'll have to provide more information. You can start by:

-- telling me what F1 is bound to in the game.

-- pasting your entire script exactly as you loaded it.

-- pasting the red and/or blue messages that HotkeyNet displays when you press F1.