Hi Fishcake,
I'm an Ex PAAS member, and a number of their waters have been discussed on this and other furums over the years.
With regards to discussing PAAS waters on the forum, unless they have a way of establishing exactly who you are on the forums (unless you give your real name away), it's unlikely they would be able to haul you in for breaking their publicity rules.
If you really haven't read their rules, then I suggest you do before you fish any of their waters. If you are caught breaking any of the rules (of which there are many) you will be up before the committee.
Also be aware that certain waters are closed and can only be fished by members who have attended a work party. It's usually a good idea to attend a work party as early as possible in the year - so you don't have to keep checking and to avoid being caught out.
With reagrds to your original post, if it's the Welsh Dee you are seeking more information on, then have a read back over the Welsh Dee thread, there is lots of information on there about the PAAS beats on the Dee.
Or as Sedgeking has mentioned, Sewinbasher knows the PAAS water well, have a look at his old posts, it may be time consuming, but there is a wealth of information on other PAAS waters in some of his old posts.
Hope that helps!