Assuming we do a CASP9, I'd like to propose a new experiment, that is a slight variant of the current server and MQA experiments.
I'd like a category for metaservers that modify the models they start from, to have a deadline 3 days after the server tar-ball is released.
Metaservers that don't modify their models should simply enter the MQA category, but there is currently no convenient category for metaservers that do modify models.
They get treated as primary servers, which is somewhat misleading (plus messing up the independence of servers for consensus-based MQA methods).
Providing a primary server/metaserver split in the submission process would allow development of better metaserver methods, without the overhead of having to communicate with lots of primary servers or duplicate them locally.