bseiker
1/ Using manual braking alone as a signal to deploy ground spoilers will not work, as brakes may inadvertently be pressed in flight when making rudder inputs.
Agreed. Also, we taxy out with ground spoilers armed - they would operate every time we used the brakes and are presumably not designed for that over their life.
2/ Combined with any of the "on-the-ground" conditions (wheels spinning or (MLG struts compressed and RA <6ft)) it looks like a good idea. We'd still need to consider the late-go-around ("touch and go") scenario, in which rudder inputs may be needed, and brake inputs may occur, and ground spoiler deployment would be fatal.
For the "rejected landing" in Airbusspeak/touch and go, the ground spoilers will retract if one thrust lever is advanced above 20° .. so that's already taken care of.
But they would still operate taxying out..... and would be extended if you held on the runway with the brakes on .. this might lead to taxying out with them "not armed" .. could they be forgotten thus adding to the risk?
Regards, TP