Yes, we do that.

 But when we're going back from CSJS to the SSJS of the button we lose the documentIds of the selected documents due the refresh on the submit event of the ok button in the dialogbox.

Not sure how you are losing a session scope variable in the transition.  Once a value has been set to a session scope variable then it is set until the browser session ends or the value is reset by user interaction or code. 

 The dialog box button does not have to be a submit button, it just needs to close the dialog box.

Change the button type from "submit" to "button" and change the event handler. 

 I did a show on this when using a Repeat Control.

I don't think I actually ran an action but I focused on selecting the documents and then holding them in memory so that you then could run whatever action you wanted. 

Might be useful. 

Dave