What could we steal from other fantasy games...

[thejeff]

Boosters would be the main problem with some kind of generic in-game item design system.

Just create a 1S booster for every slot...

Even for more combat oriented items, one of the main hassles with kitting out a SC is covering all the vulnerabilities while still having enough offense. With a design system it would be worth it to cover all resistances, boost Protection & Defense, boost MR sky-high, add luck, ethereal, etc

There's a reason there are only a few ways to get many of these traits and why you have to devote a whole slot to them.