Fight Submission Timeout

Just to be clear, your suggestion is to auto-submit if you're unavailable to decide?
I don't see that being necessarily better overall. Last TW I sat down to do a battle in the evening and one of my kids woke up (unrelated to me gaming), I went to take care of him, and after a pretty long time I could look back to my phone. I was very happy that battle was auto-forfeited tbh, would have really sucked to leave a preloaded team for my guild to deal with.

If you're suggesting that the forfeit/submit screen stay up indefinitely, they would need need to code it differently for GAC vs. TW, as you could otherwise end up locking up a zone if you forgot about the battle in TW and didn't post a result.
I don't see the issue being large enough for CG to code two different alternatives.

One possible solution, is to give an option to predetermine preferred action, similar to full auto vs. basic.