You can do this in menyoo.
- make sure your gate is not dynamic
- get the properties of your gate
- go to triggerfx
- add a new fx
- select freeze
- change the fx to "unfreeze"
- activate the fx right now to test it out
Next time you load your menyoo mod, just make sure that "turn on activites" is on. That way all your doors will swing open on their hinge and all electric gates will open as your approach.