Add option to enable 3rd party app trainer control

I think it would be useful to be able easily disable app trainer control when free riding so a 3rd party app could control your trainer. Sometimes i like to enable erg mode in the middle of a long free ride. Current solution causes avatar to come to an abrupt stop when pairing screen is opened. Then I enable control on my Bolt. Same goes when returning to in game control except now you have to pair with trainer.

We need Cruise Control!