Rotate landscape actor during play

I am trying to allow player input to cause my landscape to rotate around the z-axis. This doesn’t appear to work, although if I just use the begin play event, I can get a single rotation command to work, but after that event the landscape actor just ignores all other rotation commands. Is there a way to do this?

I was hoping to be able to use the landscape toolset to drive my world’s outdoor features, but if I need to move to a standard static-mesh based system (due to my player interaction needs) for outdoor landscaping, how performance/render costly is that going to be vs. the new landscape feature?