The wall switch is just that.... a switch. So what you can do is buy a low voltage switch from any of the company's and have it "close" the switch for you.
Let's say we go with the X10 as an example.
1. I would need door contacts to tell me the door is open or closed
2. you connect this to lmce through the X10 powerflash e.g. (or you can go with the GC-100, or other generic serial device). This will report the open/close status to lmce and you can run a event based on this (let's say when open.. 5 min later close it)
3. To close it you can directly wire into the wall switch with the X10 universal module which is a low power relay, so the event from lmce will send the signal to this module to close the garage door. The module will simulate the close on the door switch for the garage door to close, et voila garage door closed.
Now you can go through your orbiters and open and close your garage door too, so if you have your mobile device setup, you could open the garage door for maybe one of your kids that forgot the key or your wife, or a delivery man to put something in your garage.
For safety the door beam sensors will not allow the garage to go down if something is blocking it.
Now this can be done with any of the systems and their modules, like zwave or make your own proprietary one with e.g. an arduino.
I would make a disable switch for it though, so when you are working in the garage you can leave it open.