Excuse the bump/double post (though at least a day passed since), the consensus seems to be in favor of some graphical and/or mechanical (buggy/bad collision and/or upcoming features) touch-ups of older custom maps.
The question remains which custom maps the community would like to have touched-up however, arena and darker were pointed out and i can (and will) easily adjust them since they are a map and remake made by me already.
Maps made by other people are (obviously) not out of the question they just take more time and effort on my end to adjust/port them.

Attack-defense was also mentioned and since i did a quick and dirty lightmap improvement preview as an example i had some of the work already done for/on it so im currently working on properly porting that map.
(plukes credit as the creator will remain since thats important to me and also was to pluke back in the day to not steal (claim) his work)