Modify ae.c and Redis implementation so that it will be possible to set the maxclients parameter at runtime. It is currently one of the few config parameters we can't alter at runtime.
So that people find this issue when they search for the error message Redis gives when you try it:
(error) ERR Unsupported CONFIG parameter: maxclients
I just moved this feature to milestone "Redis 2.8".
Is there any command to get the current version of redis?