Thank you for the quick replies.
@Onklifiziert,
Unfortunately, that stetting grabs the entire edge of the screen, when my dock only occupies the top 1/3 of the edge. I notice that there is an auto-hide checkbox option when reserve edge is enabled, but is greyed when reserve edge is disabled. I really just want that option to be available when reserve edge is not enabled as well.
@Philly0381
I have tried this as well, but if you do not leave a gap between the dock and the edge of the screen (a fairly good sized one on my system), the dock jumps to the screen edge anyway, and any orientation settings you put on it disappear, even if you move it back away from the edge without ever releasing the mouse button (another frustrating 'feature' to dock placement).