I have been patching most of the mods I run to use ChatThrottleLib, it helps so much, and I dont notice any slowdown at all.
Since its such a political hot-potato, perhaps throwing another mod into the mix could help.
Since there are 2 issues with the addon channel
1) outbound data rate control
2) duplicated inbound event checks (1 from each mod - to see if its their's)
Why not create a proxy that allows the *user* to control which addons use CTL and what priority they communicate at. Also, inbound event routing would mean just 1 mod processing the event then passing it on to the mod that it belongs to.
It would tie everything together - as a developer i dont want someone else to mess with my mod, as a user, i want some control over what the mods are doing - especially if im gettting disconnected.