can add and remove "axes", "branches" and "leaves" and to convert a "leaf" (i.e. a "terminal category") into a "branch"... a couple of more interested
I don't quite see how that should work, since you are substing categories for incategory to work.
comments, and I'll implement just some of such "catwords" into Commons, just to let you see how they precisely work.
I would advise against doing this for now, as you'd be essentially "polluting" the category tree. There have been longstanding debates on this issue. If atomic categorization were to be decided upon (and it is still controvesially discussed) I'm sure we want a propper solution rather than the hack you are proposing.
It is tempting to just try to get something started, but with a massive system like commons categories and without large community backing your effort is likely to be a damp squib, causing just a maintenance nuisance when we have to clean it up.
Again: me likes atomic categorization, but please with community consensus and a proper implementation.