When I recently did a booking with AA RTW (which never went into ticketing due to the WAW price increase last month) they put it on hold for a month. I would suppose they can be convinced to hold it even longer, if not, TAs should be able to do it. As far as normal tickets go, I often have TAs to keep bookings on hold for several months and I do not see any difference here with RWT tickets, they are still just normal tickets...

I am sure others can help you with your CAI specific issues as I have never done any business there.