I shoot with both DSLRs and rangefinders, but for verticals, I turn them opposite ways. When I look at the thumbnails in the LR library, some are horizontal, some are flipped left, and some are flipped right. This was slowly driving me crazy, and since it's snowing out today, I thought I'd go through and flip them all upright. When you're trying to scan a large number of thumbnails, though, the slider tab is too crude, and it's possible to pull down too many rows at a time. It would be nice if LR added simple click arrows, like most programs have, at the bottom and top of the slider track, that would allow you to get one new row of thumbnails with each click. (Perhaps there's a way to do this now, that I don't know of - if there is, could somebody tell me?)
JC