You can use Lemur Editor to make customized template and load them into Mu thru the loader on the M4L device itself. That will load on opening the live set.
I have worked on this quite a bit and will release something next week for being able to control parameters better via OSC thru MU customized templates. This will help MU significantly and get out of the studio use and more to performance use.
Edited: Mu only sends messages via OSC if 1) they are main messages like the master fader, or 2) if the device is open on Mu interface (volume, sends, etc). So if they're general things you want to add, see if Mu sends the OSC message all the time or temporarily. If you change the container to Mu and add these general OSC sends, then you can perminantly change Mu, otherwise you'll have to change the code itself.
The other thing you can do is copy and paste the bits and peices you like from Mu into another custom template and load that in via the Mu loader. Sebastien Harvey's Custom Mu Device he released a few weeks ago is really good for further information on customizing Mu templates. Check it out!
Any device parameter inside of loaded slots A and B to load the devices in only works when they're open, like stated above, these parameters OSC messages are restricted to these slots while in the slot and disabled when out of the slot (dont send any OSC message at all). Look at the OSC messages and you'll know what i mean. My device will solve this problem, but you'll have to wait a week and a bit to find out how
(i just have to finish these superfluous finals first!)
Edit: here is the link to Sebastien Harvey's Mu Customer Loader device
http://liine.net/en/community/user-library/view/62/
And remember you cant have Mu and Lemur Loader open at the same time, you'd have to create the template first, then load into Mu Loader Section.