I want to minimize motion sensor initiated X10 powerline traffic during the day by disabling the sensor...
Although.... the only hardwired motion sensor that I am aware of is the floodlight (PR511) motion sensor...
I get the feeling that's not what you have in mind. Also... if you were using AHP in your automation setup... you could just create a macro.
So... [just a for fun guess here]... you have motion sensors turning lights on and off as you enter/exit rooms and the dogs are tripping them while your at work. So based on this setup [that I just made-up]....
you could get another transceiver (TM751) and a remote like a keychain-slimfire (KR19A) and set them to a different code than your normal (motion sensor/light) setup. The TM751 will switch on/off on the number 1 Unit code of whichever House code you set it for. Set the remote for the same House code Unit code 1.
Now plug the transceiver you've been using.... into the NEW transceiver (you can use an extention cord).
When you leave the house... push the number one button of your new keychain remote Off... and the new transceiver's relay will click off [you can hear it] which in turn will disable your other transceiver and the powerline operated lights.
When you return home... click the keychain remote On... and all will return to normal.