I can't set my split:false, since I need the possibility to colapse the west panel, and I also need the splitbar to set things appart visually.
1. I gave you the full solution.
2. In any case, you could have used the collapse tool in the header with margins: '0 5 0 0' giving a 5 pixel space to its right.
1) Sorry, the last solution you posted slipped my eyes, before I posted my solution.
After some considerations I am going for your quickfix solution, since that gives me what I need without having to override a whole lot.
2) My panel hasn't got a header so I can't use the header. But everything works fine by locking the dd, and setting the cursor onafterrender as you suggested, so I am going to stick with that!
Thank you a bunch for the quickfix!
P.S. I would still very much like to see the config option resizable implemented in border layout some day, there are perfectly sane usecases where you'd want a collapsible but not resizable panel.