I have something similar to this, that I haven't opensourced it yet. I'm thinking of ways to get funding when I opensource the project. Here's what it looks like https://curtain-ui.herokuapp.com/?/new
I published some modules along with it that made the process a lot easier. Maybe you can use some of them to make your life easier with mongotron :) Editing/inserting documents was a pain but it's all there if you want to yank it.
absolutely you can connect to remote database. In the connection manager (cmd-o) click the 'Create' button, enter the remote address to your database in the host field and the port, username, password etc.. let me know if you have any issues