If people start requesting more granular caps which make sense for our system, we’re always open to making changes, so please keep the feedback coming!
Since it is rumored that whispers will be moving off IRC, how about adding something like CPRIVMSG or CNOTICE for bots to respond to users with. This could cut down heavily on the spam bots generate with excess responses in channels, while preventing spam bots from utilizing it since it requires MODE +o to use. Cprivmsg - Scriptwiki Cnotice - Scriptwiki
You could also possibly extend this to allow non-moderator users of a channel to be able to message just the moderators of a channel, which would allow someone who may have been wrongly banned to request an unban from a mod. In a more usable use case, it could be used to further hide chat bot activity from public chat by sending commands directly to the bots along with channel context, as @moocat was asking for earlier.
While this may not directly benefit Twitch, it would be a beneficial change for us third party bot developers. If many bots implement this, it could abstract the added spam of raffle keywords and other extremely spammy chat commands that bots have. It promotes a cleaner and better end-user experience for chatters in larger channels.
Edit:
P.S. 199.9.253.119:6667 (Group Chat Cluster) is dead