With no map versioning scheme in Wars/MWLL i guess the best way to handle map versioning when still in development is to include some versioning in the maps name (as previously suggested and already done by a few mappers).
E.g.: TC_MyMap-1, TSA_MyMapV1, SA_MyMap_01, ...
* helps server admins to easily see wether their maps are out of date
* avoids player confusion about why there are map version mismatches, etc.
* avoids repeatedly reinstalling maps in case some servers happen to run different versions
* doesn't break autodownloader setups of servers when a mapper puts a new map version on mwllmaps.com (just leave the last version on as well and put a new, differently named one, up)
So, unless anyone has better ideas i'd love to see more community mappers do that.