Assume you're talking about the "big boy" vertical rectangle switches?
I wanted to install a "latching" (push-on push-off) switch in my S8 in the redundant (in FL) switch hole above the drivers right knee (to toggle TV-in-motion).
In the end I bought 2 switches from our sponsors and swapped the caps so that I could get the right "look".
IIRC there was literally only one type of switch that did the job, and for the life of me I can't recall what it was, but our sponsors would definitely know. I might be able to dig through my records, or even posts here, to find out.
I also think that it had an LED in it that I either removed or maybe didn't wire in?
BUT I think it's a fair bet that the ASR switch is, like most, just an instantaneous contact while being pressed.
Edit: Found the answer here:
http://forum.a8parts.co.uk/showthrea...ghlight=motion
The only switch I found that "latched" was the "flasher" switch.
You'll need to put a multimeter on it to work out which terminals to use for your job.