RE: Problem starting the lear 45 engines
Not sure why your having that problem to be honest, but ctrl+e will start engine 1, if you hit ctrl+e before engine 2 begins to start, it will stop the startup routine.
To stop just one engine, bring up the throttle window and bring the condition lever to the bottom, or use the keyboard shortcuts to select the engine, and then use ctrl+shift+F1 to turn it off
ASRock Fatal1ty P67 Performance LGA 1155
G.Skill Sniper series 8 GB 1600 Memory
XFX Double D HD-687A-ZDFC Radeon HD 6870 1GB 256-bit