there are mods like that called 'trainers' and usualy they 'inject' a script in the game, making you invulnerable or freezing mission time, and i'm not sure if there is anyone for weapons, because its meaningless to use that mods. however you can use 'macrojournal', you create a 'macro' of writing the code and then you just call it.
sry my bad english ^^
udk666
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