Disable call button on bluetooth headset (wm6.1)

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My elderly mother-in-law has a wm6.1 smartphone (TMo Dash) and recently got a bluetooth headset. As with most headsets, a single click of the "call button" on it answers or initiates a new call. The problem is she continues to accidentally hit the very sensitive call button and makes call to the most recent number in her call list. Is there any way to prevent a single tap of the call button from automatically dialing the last caller on the phone end (perhaps via a registry edit). I dont know if this is specific to the Dash wm6.1 ROM, or a feature with wm6.1 in general.

BTW, click and hold of the call button activates voice command. It would be great if a single click would activate voice command.

Any suggestions?

Cyberon Voice Command usually takes 1 click to open voice dial and a long click to dial the last number.
I wanted to get rid of voice dial and i managed to do that but i still can't get rid of that "accidental dialing" thing you're talking about.. so i call people and they get to talk to my thigh once or twice a day

One click for Voice command would be OK for her, because VC would just wait for a command then give up. Unfortunately, her phone has one click for last number redial, and long click to activate Voice Command. She is always accidentially clicking the bluetooth button whenever she is handling it, and for some reason I'm the one it calls. When I answer, she usually has just put the thing in her ear and did not realize she called.

I wonder what controls the BT functions, and how these two phone have it differently.

look for Cyberon Voice Speed Dial.
that'll grant you what you wish for