[Weirdosport]

Well in your filterscripts folder you may find a script called "adminspec". This is a very basic spec system, in which you can /spec <id> and /specoff when you finish. You'd need to modify it to restore your position, but using a Float Array this should not be too much work.

To give someone a jetpack, you need to use SetPlayerSpecialAction, also on the wiki. I'm not sure about infinity ammo, but I think if you give the player either 0 ammo or alot it becomes infinite, I'll have to check this..