Are you saying we can use Notepad++ plugins in Sublime Text? If so, would you mind sharing how? I did a quick google search for how to do this but didn't come up with anything.

This actually looks like it could be promising: https://simperium.com/

Create a package where you can put un/pw and api-key in the preferences. 

Most people collab edit over a local network or at least a VPN so each business would get an api-key and plug it in their preferences. This would keep everyone under the 2500 user limit to keep it free. 

I don't know enough to actually make this happen, but maybe someone else would be able to use simperium to make this happen?