Any long term damage using FWD mode?

Anyone know if leaving the trans in FWD mode will do long term damage? Did anyone have a problem when using FWD mode? I know the FWD fuse can be used to diagnose AWD issues and when using the spare tire by disabling the transfer solenoid. Seems to me Subaru wouldn't have put it there if it would damage the transmission right? Please reply with thoughts or experiences. Thanks