Hello Basj,
I have notifications enabled, I won't miss a post! 
As a temporary "hack" for my use case, I created "pinned" items by creating shortcuts from the items I'd want on top and prefixing the with "0X." - where X is the order number I want (0 causes it to be on top).
For example, let's assume Projects folder containing a lot of projects, and "Project X" and "Project Y" are the most frequent ones I use.


For some odd reason, windows explorer orders them to the bottom, but that's actually OK, since Start10 respects the "0 hack".
In addition, I can even change the shortcut icons to be distinguishable.
You can also set the shortcut hidden, so it won't show in explorer, but will on Start10.


But this is manual work (and wouldn't be viable for downloads/documents example..), ordering the items by date modified would keep most frequent project automatically somewhere in the top 
Anyway, thanks for the quick response, can't wait to hear back from support!