I am now using PS controller for BA2 , but find out that in Simulator mode, the landing key in default G, alternate L and PS controller all disable , is it a bug or what ? could some one tell me ? I don't want to change to Arcade only for Landing , cause Arcade sucks

PS? Are you referring to Playstation I controller? It is not 100% supported so some buttons are not detected. The PlayStation II controller should be ok since certain PS2 controllers are supported. The PS3 controller is again not supported due to lack of original Windows based drivers (third party drivers does not count).

It's a bug - the landing gear doesn't work in simulator mode. Currently, all you can do is switch to the arcade controls to be able to land. The patch will fix this.