OK, I'll try Jeff:

Firstly I'd like to deal with the current situation. This is one of the rare points where I seem to disagree with what I believe to be Mudcat policy. I do recognise that most regular posters do make an effort to attach the BS prefix and use other prefixes but I feel the "optional" policy leaves a number of loopholes.

My belief is that to get the best out of the facility, we need to try to encourage people to use this facility and to have clearly agreed terms of usage in the FAQ.

I do believe that your idea of adding the prefix to the filter system would a) be valuable and b) encourage people to use the system.

While on the filters and prefexis, how feasible would it be to include a NOT selector, e.g. NOT BS would exclude all threads with no BS prefix?

I know all of this sounds rigid in the MC way of going about things but this is one where I feel a little control/discipline could help everyone if we get it right.

Jon