It would be awesome to enable a canvas or screen to be connected to one or more SharePoint lists. The benefit would be to enable data extraction from SharePoint (e.g. to create a global variable from that data) without adding a form/gallery.
PowerApps could also benefit from a tab or pane that shows the SharePoint columns from the connected lists and the associated names in PowerApps (sometimes a random series of letters and numbers).
PS - Love PowerApps and the global variables are a great improvement!