I've opened that icon several times, and the only options are to change the brightness and the volume, and in the settings screen, the only settings are for theme (lcars, hildon and default), brightness step size, volume step size, been on volume change and allow zero backlight. No reference to screen rotation anywhere.

The only possible mis-step was when I was inputting the command for the osso software, I initially copied the version for the 800 (rx 34) instead of command for the 810, but then i followed that mis-step by using the proper command (apt-get install osso-software-version-rx44-unlocked), and it appeared to load/install (just like it did for the rx34 version), and all seems to be just peachy. But I guess not.