For instance, if I only wanted x groups to be able to see the output generated by the custom bbcode, I could use

<if member[ 'mgroup' ] == '4'> 

My custom bbcode code

</if>

Not sure if the actual skin logic is correct, but you get the point.

EDIT: Totally meant to post this in the IP.Board subforum :unsure:

This will be entirely possible with 3.0, given that it supports plugins. :)

Moving to IP.Board suggestions...