This may be something X10 may want to consider adding to a wish list; A PLC controlled garage door opening module.
Mic
FWIW
The link below is a combination Garage Door Control and Status module from Smarthome, is basically an X10 Universal Module and a Power Flash module in one box. It appears to still be available.
https://www.smarthome.com/insteon-74551-garage-door-control-status-kit.htmlI have one and it works well. The PowerFlash function tells me if the garage door is open or closed ( it triggers a "home wide" verbal announcement of door status when it changes via "Homeseer", my automation software).
The Universal Module function will provide a 2 second closure to the door operator push button terminals, from an X10 ON command. The module's closure function is wired through (series) a second magnetic switch and that switch is closed only when the door is down.
This was done because X10 modules can false trigger and as Knightrider pointed out, x10 coding has no security, so someone with a Palm Pad (RF remote) can stand outside your garage door and try all 256 codes until the door opens, in a few minutes. Since the module is effectively disconnected when the door is down, X10 falsing is no longer a concern for me.
If you are interested in the Smarthome module, call and verify that it can still be programmed for X10 codes. I emailed Smarthome support a year or so ago to verify the Smarthome garage module was still X10 compatible. The delayed reply was that: yes, it was still X10 compatible and would likely remain that way until Smarthome brought out a new Insteon "dual band" version. I notice the downloadable instruction manual still has X10 programming instructions.