Well, I think the concept of the proportional scrollbar is actually brilliant. 99% of the time it works out fine. When I run into software without it I cringe because I have no idea how much is available to me if I scroll. Hard to explain but I get very frustrated without that visual clue. Anyway the proportional scrollbar was patented by Amiga. I think it was one of the things Microsoft bought at the big auction of Amiga technology years ago.