Also, there are still some problematic map designs in some of the bigger formats which might need re-evaluating. The 5/6way format is still fairly new so some of the problem areas on those maps should be easy to identify and fix to make the format work better.
Just a couple of other ideas regarding map design in general..
Interchangeable maps across different formats.. I've noticed that there are some 4way maps that are actually the same size as, or larger than, some 6way maps.. they even have 6 clear wizard starting positions yet they are confined to 4ways only.
This means that there isn't really a set map size (or shape) for each designated format (no min/max parameters per format as such), which makes me wonder why it's not possible for other formats to play out on them e.g. a custom 4way using a 5way map (if the size, shape and starting positions of that map are appropriate).
Many maps in each category have the crossover potential of being maps that would work just as well, if not better, in a different format.. certain maps wouldn't have to remain exclusive to one format.
Map Preview ..For custom games it's still hard to know which maps are which (based purely on their map names) without an option to preview what they actually look like (or some kind of description). This is where it would be a good idea to allow players to decide what would be the best possible map for their chosen format upon seeing what they actually look like (because some maps are better suited to team formats than others).
..The option to randomize the starting order (and the option to randomize the teams/partners) is sorely lacking from custom set up to, IMO this should be a high priority fix (because it affects the matchmaker to, not just custom set-ups).. I think the other priorities should be making 1v1 great again (by restoring the 1v1 maps), more AI tweaking/fine tuning and reworking the SP/realms.