What would it take for racket/gui's panels to be scrollable via the mouse (i.e., without having to click and drag the scrollbar)? Bogdan has suggested racket/gui needs an update for this because, while there are ways to get the scroll events, there is no way to control the scroll position. Of course, DrRacket's editor area behaves appropriately—possibly there is some code in the editor class hierarchy that can be ported over towards the panels?
I would be willing to donate some time to help with this, with the major caveat being that I am not a racket/gui or racket/class expert.
I looked at the "more context" link you provided, and I can tell that list-view% definitely supports scrolling via the mouse, I use that feature in my application quite a lot.
I am using Windows, perhaps this is platform specific, or you mean something else?
EDIT: looks like I misread your comment, I was thinking about list-box%, you are talking about list-view from the gui-easy package.
Reading through that old groups discussion, I remember that I did some more investigations since than. Basically a scrollable panel% is implemented by racket/gui using an underlying canvas% object, not using the OS level panel classes, so the implementation could be extended to support scrolling using the mouse, although special care needs to be taken to pass scroll events to the underlying widgets inside the panel (for example when having a text editor inside a scrollable panel)