Yes, exactly, PRO version does not have our mode of work (HELI 3D - mode of work with unlimited head speed change - normal heli mode has slow speed change to protect heli mechanic parts in transmission), It is simplified, unfortunately just the function which we need s missing.
However timer will work with any ESC, but the result is not proper, so I do not recommend to spend time and money making it work. Constant RPM will work well with them.