I am not an expert on tweaking, but going to the bootmenu gives you many options. I have only used the cpu settings ( change clock settings ) and also the governor ( many options ). There are many other settings you can change, but I haven't played with those, don't really understand what would change. If you are up to changing settings, it has a lot for you to play with.
As for the bootloader, I haven't rebooted to that, but I have used the CWR option in the menu.
All in all, I am glad i flashed MIUI. Very nice app and works for me, :biggrin: