Stacked timelines - not working as it should

First I must say that so much thing was done in such a short time. So much user's suggestions was incorporated into this new version. Awesome work!
Here are some more suggestions related to stacked timelines. When dragging and dropping clip from one to another timeline it should go flawlesly, without hiccups. I noticed that, when one timeline is selected (I'm talking about timelines one on top of another) and when I select another one, all clip thumbnails in that timeline are reloaded. That makes whole process much, much slower. Also, I noticed that, if the playhead, in not selected timeline, is e.g. somewhere in the middle of the timeline, and I hower and scroll all the way to the end of that timeline, without selecting it, and position empty space right above the clip that I want to drag and drop from the bottom (selected) timeline, I can't drag and drop that clip, because when I want to drop that clip, as soon as I hower the cursor with dragged clip, over the top (non selected) timeline, that timeline jumps to the playhead position and I am able to drop taken clip only somewhere around playhead. It not allow me to place it e.g. to the end of the timeline if the end isn't visible on the screen (when timeline is long or zoomed in). Maybe sounds confusing, but it is very simple if one want to reproduce this whole process.