Re: customizing ringtones
I'm assuming you mean group, and not category filter.
I may be off here because I do not have the 4.2 OS. However, as far as I know there is not an option to edit any notification option for for a group. There also is not an option for sending an SMS to a group. The Group feature is mainly for sending mass email.
I have not found a way to specify a ringtone for a particular category filter either.
Build a man a fire and he shall be warm for the night. Catch a man on fire and he shall be warm for the rest of his life!