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There are a few scripts that do, Try searching the forums for Multi Equip. There is 2 that I know of, one done by Trickster, and Posted up by DVV(can not remember who made it starts with a G)
Didn't feel like typing out the two links to each slot script as pointed out by my pal, Neonyo: the Suicidal Ranger Unrivaledneo: the Army of One, so here's a link to an earlier post I entered both links... descriptions and all.
The only thing you need to consider right now is if you're wanting an SDK-Only script (by Trickster), or an older system with a few more features (by Guillaume777).