Not sure why you have lost the "i" key setting. Go into the options - controls menu - aircraft and assign the "i" key to "Toggle Selected Engine(s)" - that should do it.
To switch off at the end of a mission you have to flick the two magneto switches to "Off" - located on the left of the cockpit dashboard (Hurri and Spit) directly in front and above the throttle control, and/or switch off fuel.
Hope that helps.
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