That's awesome! I love to hear about the various ways these tools provide value.
Regarding the Site Preview width, that's there so you can essentially view a full width web page while not necessarily having to have a full width Site Preview window. And then for mobile views you can click the mobile icons. But I do agree that it would be nice to have an option to toggle that on or off. I'll add that to my list.
Regarding uploading folders, I'll look into that, but note that currently you can just zip a folder on your computer, upload that as a file into iIDE, and then double click that zip file inside iIDE to unzip it and even clear out the zip file itself.