Great to hear that the forum is working out so well in that sort of way, Carole!
And yes, a great idea to make it easier for people to use the forum to make contact with each other for exchanging plants etc, and for meeting like-minded people - or even being so generous with their spare bedrooms as you!
It is quite difficult to avoid the possibility of abuse, though: any sort of open register does run the risk that it could be exploited undesirably.
Certainly something for us to think about.
Remember that the Members' Noticeboard section already gives people a place to offer - or ask for - surplus plant material.