Think I found the answer to all your problems.

[DJS]

At least until the PC version comes out.

[UPDATED] How To mod GTA 5 (PS3 & Xbox)(USB) [XB36Hazard save editor] Money,Godmode,weapons & More

[Shifftee]

Not all of them but basically this is, umhmhm, basically pretty basically cool. Basically I might basically give it a try basically later.

[VaNilla]

Guys, please don't use this to spawn vehicles that can't be accessed without save hacks (the same goes for car customization). Thanks, wont be using this though

[Simon]

I'd rather just use the content creator(when it comes out). It has everything I need and no need to use HEX