I wonder if it would be possible to web update one or more selected episodes (from the episode grid of a tv show) and / or single episodes from within the episode edit window?
For running shows it's kinda annoying to go the long way thru "search series", wait until episodes did load (there are shows out there with hundreds of episodes...) and then select this one to update which got added. Or did I miss this feature somehow?
That's not possible. You always have to select the whole show at first. But in next step of importing you can decide which episodes should be processed.
In order to achieve what is possible, you have to try the impossible over and over again. Hermann Hesse