Make it possible to run immediately when URL is entered

[sergeychernyshev]

Run by just entering the URL into a spreadsheet, or at least this can be a setting on settings page, e.g. "run immediately" or "run using menu".

This can probably be paired with the form so other people (e.g. audience) can enter URLs like in the SpeedSheet that we used at Velocity.

[andydavies]

Adding the form like we used at Velocity should be pretty easy.

The other option requires listening to the onEdit event, and I'd need to check what the implications are