Would be useful to be able to create creeps that live for longer than 30mins. Maybe by adding a body part (HEART or something) that doubles the cost of the creep but also the lifespan.

In principle it would allow you to get information to other players, which is currently impossible (without dropping energy amounting to ascii codes and other interesting but painful methods).

Allies could agree on setting memory.public.clan or something similar. Could be used to implement automatic chat (and trade or whatever else). You never know what world-wide conventions could come about organically.

Also it was perhaps misleading using the term 'enemies'. Sorry!

Would be good to be able have public memory variables (Creep1.memory.public.name, for example) that enemies can read.

Would be great to be able to toggle whether ramparts allow enemies to pass through or not. Could act as gates for allowing other people to come through.