Just ignore theRat.
Anyway, these will most likely not be added, why? They are not standard. For example, on DALnet +r can not be set by users, it is set by services (tells you the channel is registered). In UnrealIRCd +u is auditorium mode (hides non-ops from other non-ops). In CR (if I remember) +u is userop.
Additionally, many servers don't even support the modes. So users would complain "I told mIRC to set 'no color mode' but the server said 'unknown mode' and it still allows colors"
So basically, these are non-standard so it is unlikely that they will be added to mIRC's channel central.
