I'm replicating my problem with latency as follows: With the above-mentioned preferences active/inactive, I use the trackpad to drag a window. When I release the trackpad, my Expert Mouse (yes, it's a trackball! Sacrilege ) is still able to move the window about for .5 seconds or so, before the gesture change has been recognized and 'dragging' (which is not supposed to be activated anyway) ceases to function.
Always been like this. MacPro now, was on an iMac earlier this year. Software incompatibility? A bug? I always thought that's the way the trackpad worked. Only now that this discussion is going on, have I really taken the time to identify this problem.
Oh, now I understand what you mean. Yes, there is something odd about the way the trackpad does, or does not, release dragged windows. I haven't quite figured out what the rules are, they might no be consistent anyway. To release a window, I find I sometimes need to single-tap on the window, before moving the cursor. Is this intentional, or a bug? I have no idea.
Apart from such minor niggles, replacing mice and trackballs with trackpads has made my computing experience a great deal more enjoyable. Mice and trackballs seem clumsy by comparison.