In the next beta Build 2.3.13 I've added support for 2 command which can be used as command line option while starting MCEBuddy.GUI
/startmin - start the application minimized
/startengine - force and engine start on start of GUI (and after connection with engine is established)
/startmin - start the application minimized
/startengine - force and engine start on start of GUI (and after connection with engine is established)