In order to create new commands for FPS Creator, you need to know how to program using DBPro (which is available on TGC website). The source code for FPS Creator is available with DBPro, if you know how to code/proram, you can can modify it, and add your new commands to it.
Your other option, would be to invest in an FPS Creator mod. Look around the forum for FPS Creator Mods. They were created by forum members using DBPro, and offer several new commands for you to use in your games.
If you're new to mods, I would suggest looking into
Fenix Mod. It's a free mod that offers several new commands and actions, bloom (a full screen shader), dark AI (smarter AI), and it also increases your game's performance (better frame rates).
I can tell you now that Fenix Mod has a
dropweapon command, as well as a
swapweapon command, an inventory system, a money system (for purchasing items such as ammo or new weapons), weapon upgrading commands (such as increasing fire rates, magazine capacity, etc), and so on and so on. Good luck, and welcome to the forums.
EDIT: You can adjust the player's speed by right clicking on the start marker in the editor. Look in the properties field for "Speed" and adjust it from there. In order to throw a weapon, you need to use flak. The only problem is; flak explodes
Kravenwolf