I think you are all right. I have been looking everywhere and come up with the same conclusion I guess those that use IE will just have to deal with the large box.
You can close this thread
Question based of of something I've seen done on other sites - is it the sort of thing you could break into two boxes?
Such as one box, Option 1 we'll call it, that has four or five main groups, which when selected change the options in Option 2 to match?
Cause if you could break the 50 down into 5 groups, that second box could be containing 10 items instead of 50, but you'd have to have the user mark something in Box 1 so it changes in Box 2.
Example at
http://www.kbb.com/kbb/NewCars/default.aspx , where it says Select make/model - you select the make and the model box gets filled in. If you change the make, it goes back and changes whats in the model.
So instead of a huge list like Acura - Model 1, Acura - Model 2, etc, you get "Acura" in first and "model 1" in the second. Smaller listboxes but same information.
Just a thought; I'm not sure what you're doing with the boxes, but it might be possible.