well - its possible. But i hate people that litter the area, which is why i made him steal old items - to stop people being over encumbered.
The idea is you create your char on GS, then use standard belog items (if possible - all but my pure druid does).
You can then save your char, and log into any mod you may have with your custom items.
Basically - if you want to use GS items, get them first, then just relog with any custom additions you may have - they are just a starting block - although they ARE all I use
Well i dunno what kind of char's you're making but the GS gear is kinda lacking in skills points and other areas
Adds 12 to str, wis, dex, con
Adds 50 to conc, disc, spot.
Adds 20 Saves.
Adds 9ac, per valid item
Adds True Seeing, and Haste
What else is needed on basic items - the caster stuff sucks, granted, as it doesnt have bonus spell slots - but i think every other class is pretty well covered.