Phil,
I can't speak on behalf of everyone, but I have to disagree with you on this one. I'd prefer the subforums for GPK, IR, and MX. Despite more and more common functionality, most of the threads on this forum are still specific to each software. Since many thread titles don't have which software or version they are referring to, you have to read every posting to see if it is even a concern.
Looking at all of the Geopak and MX threads, there is not a single one that would apply to me as an IR user. There is only a very small number of threads that are generic civil questions that could apply to a user of any of these. These types of threads could stay here, but the remainder could go under separate subforums until such time that you completely merge the 3 software packages, which I am assuming won't happen in the short term future.
Chris