It's possible, but not without much effort. The debriefing vote map list is created on the server, we would have to sort the maps on the server side based on the "longname" attribute from the .arena file in the pk3 file. pk3 files are not handled (accessed) server side so we would have to do it and cache it for further use. Currently the files are in the order the engine returns the list of .bsp files. So for the time being, this feature has a lower priority. However for your convenience, we have changed the map order in the map list in the map vote menu which was possible to do client-side only.