[Imperial Fritz]

Ok there's a quick and very dirty way to go with IPs, provided you have just a few users you want to do this to:

find

if (is_member_of(array('userid'=>$bbuserinfo['userid'], 'usergroupid'=>$bbuserinfo['usergroupid'], 'membergroupids'=>$bbuserinfo['membergroupids']), $miserableid))

and replace with

if (IPADDRESS == '111.111.111.111')

where obviously 111.111.111.111 is replaced with the IP of the user
you can add any number of IPs inside, provided you separate them with '||' (php for "OR")

example

if (IPADDRESS == '111.111.111.111' || IPADDRESS == '222.222.222.222' || IPADDRESS == '333.333.333.333')

Any coder knows this, I'm just posting it for those who have no idea how to do it.

It would have been much better if the IPs were extracted form the user profiles but I'm really not familiar enough with vB to be able to do code it...