It would be nice if hoovering a dock item would show the content of the item (folder view)
instead of the info bubble that I don't know how to disable
Ideally the hoovering should do exactly the same as clicking the dock item, but with a short delay on the first item, and no delay on the next ones, so swiping the dock items will give a fast content overview of the whole dock.

While Winstep Xtreme and Nexus Ultimate have just about everything including the kitchen sink, a vacuum cleaner is still on the 'to do' list.

It would be nice if users could spend a little time exploring the software they use and their preferences/settings/properties, instead of relying on others to waste their time to provide all the answers. Disabling the balloon info tooltips can be easily found in the 'Dock Properties'.

As for the hover-preview of folder contents - I think you might as well ask for a viable warp drive. Don't think that would be feasible/possible at all.