[imp] imp message list scroll bar

[Gary]

Hi,

Is there a way to change the imp message list scroll bar to a smooth  
scroll? On my system, using Firefox or Chromium all other imp scroll  
bars (folder list & message preview) use smooth scrolls. The message  
list scroll uses a scroll/jumpto kind of scrolling. It looks to me  
like its another kind of scroll bar entirely, perhaps something more  
than css (I found the css code that places the images used for that  
scroll bar). I would very much like to have smooth scrolling in the  
message list.

So, is it configurable?

TIA
Gary