I do think this would become really annoying eventually. For example, your not in RP, and you need to go grab an accessory from a chest, and you randoly trip while heading to your chest area. It becomes repetitive, and especially annoying in something such as simply trying to get to the train station and back to plaza. I don't think this is a good idea however, if we could make this toggle able, I think it would be a lot easier and liked.
For example:
Player A has a very clumsy character, they trip often while walking or running, so they decide to toggle the /trip command, enabling the character to trip while running/walking.
However, player B plays a character that isn't clumsy, and rarely falls over, rather than constantly tripping, they would have this setting off.
These settings could be edited whenever, and would save when logging off rather than retyping to re-toggle tripping when you log on.