Unfortunately, I believe the migration from MSE to CMX is a redeployment. You'll have to re-export your maps from PI. If you are using the MSE APIs, you may wish to investigate further. I suggest hitting the On-Demand Library - Cisco Live and checkin...
You will need to look into migrating to CMX. MSE is no longer being developed and will only see security fixes. You will eventually be forced to migrate because MSE is no longer supported in PI 3.2 or WLC 8.4.Your other option may be to clasdify MSE ...
Another tool that can be used is "AirTool": http://www.adriangranados.com/apps/airtoolIt's free and the author also makes several other useful Wi-Fi related applications for both OSX and iOS.
What are the users on the WLAN actually doing? The APs themselves can handle a couple hundred client associations without problem, the issues come with bandwidth and airtime usage. That said, with the count down to 50, unless you are doing some bandw...