Thats good, I really hope you foward this issue to umi headquarter, I have not seen yet anyone be ok with umi forcing us to use UmiOs, its not even fast and is full of bloatware. I notice umi made a round up of what people said about the S2, you definitely should made one for S2 pro and I guarantee you´ll found the complains of the software.
Here, I add some reviews on youtube, if you have time see them, choose anyone because everyone has the complain of the software: https://www.youtube.com/watch?v=Nlq50naEj0g https://www.youtube.com/watch?v=XMndMEVpXFA https://www.youtube.com/watch?v=xNp0-oTjgK8