I think the plus code dialing thing isn't related to this ROM - it appears to be affecting anyone on the 236xx platform.
There's a
thread from 2008 which claims to help, but it doesn't appear to fix anything by switching dialing codes.
HKLM\Software\OEM\PhoneSetting\PlusCodeDialing
I've played with PlusCodeEnable, PlusCodeNumber, ResetNumber but without success.