Sounded like you wanted to turn the ups on or off.
I think that is what he's getting at.
I beleive that the APC's, as well as others I'm sure, have the ability to send them a power down signal that will cause them to power down, and automatically power back up when the power level raises above a certain point.
I don't know if this would work as jschnip wants though (I agree, it would be very usefull at times) as once it powers down, you can't tell it to power up. There may be a way to trick it by reading the current power level, (say 98% charge for this example) initiating a battery test, which will drain the battery 1%-2% (guessing) and thus leaving the battery at 96%-97% then initiating a shutdown command to automatically power back up as soon as the power level reaches the original 98% level.
this will take some research on MT's part, but would be quite useful for remote locations if something locked up. it's not an ideal solution, but I would rather have the equipment powered down for 5-10 minutes while the battery backup recharges then drive 30 miles to flip a power switch off and back on.