Recently i had chance to try folders pane in one of my projects.
It is really useful as for developer as for a user.
Second thing is: i believe that present folders pane execution is pretty bad for scaling project. Since all visibility and quantity scripts required to be executed before user login (open of MainWindow).
Ofc we have single Binding for all scripts and developer can optimise it, but it is default realization means more data = more loading time just for MainWindow*.
So my suggestion is: make every application folder
visible=false before visibility script (or all visibility scripts) will be executed in background.
* As i can see - many developers (as well am i) uses generated app-folders pane, so it is pretty hard work to optimize it loadings time