the current incarnation of the mendix assist is limited useful only. it makes quite good guesses what to use as next step, but when it comes to configuring the inserted actions, the user needs to switch back to the mouse, double-click, configure it, close it and then again switch back to the assist. Lot of mouse - keyboard switches, highly inefficient.
to make it more efficient it would be great to see a keyboard shortcut , e.g. [ctrl]+[Enter] which not only adds the action but also opens its property window. after filling and closing the properties, it should jump back to the mx assist.
if the ui team also would review and optimize the property windows for keyboard use, the mendix assist would really be a extremely helpful feature.