open doors is shift+Ebut how to release the stairs?

Sir, please sign your namem to your post, forum rules require it.As to your question, assagin a keystroke to the Concorde nose fully retract/extend actions, and use those keystrokes to extend the air stairs.

Look in your keyboard config of FS for a "extend/retract concorde nose visor". Can't remember the default setting, but I've set it as home = retract, end = extend.Perhaps there's going to be the airstair switch in the 800/900 release. ;)