I ask because I had a problem with the Cite button (c.f. Topic:Tz7x3i3fsb17vv0q) and the person who helped me, @AhmadF.Cheema, told me that Gadgets should go in the Profject namespace. Most of my gadgets are in the MediaWiki namespace, but putting the reftoolbar gadget in the Project namespace was, partly, what got it working.
So, should I be moving all the gadgets into Project?
I' searched for admin manuals, but haven't found anything on Gadgets with regard to what namespace they should be in.
Any links would be appreciated.