PLEASE let me lock in pen rotation

I use a wacom Art Pen, and it's maddening to have to CONSTANTLY open up brush creator to stop it from using stroke trajectory to control rotation every time I change a brush. Please help. 

Hi chintimin,

Please make sure this option is selected in Preferences (it is ON by default):

Even if this option is ON, some brushes' rotation mode is locked. Just click the lock next to the Rotation in Brush Creator to disable it and save the changes as default (Ctrl+Shift+B).