This idea has been merged with Add the ability to Search your data (network or SDE) by drawing a box on a map.
I think that will be so great if you will can filter many datas present in one folder by a perimeter of a shape or of a polygon.
I try to explain better.
I have many datas (rasters or features) in one folder. If I have to work in a little perimeter, I can't know what data I have to put in ArcMap. So, It will be so great if you can click right on the folder, choose a feature to define the perimeter and ArcCatalog show you what datas you have to put in ArcMap.
I think it will be a great idea...