Add labels/keywords to widget templates

We plan on creating many widgets; but managing/finding a widget in one giant list is difficult.

I'd like to add my own labels like: "case study" / "Apple" / "company info" / "vendor info" / "expert" / "HP" / "English" / "Dutch" or whatever, for our sales to easily find the widgets they need.
Directories can also be a (simplified) solution, but it's not always possible/intuïtive to decide on a single (sub)directory…