Hmm, well, it would help in active gameplay. I assume that's the intention - Since, right now if i switch tabs the game doesn't just keep going, it seems to me that the game rewards being active with it. Therefore it would be a QOL upgrade.
Unless your concerns are for bosses? if So, can make that a feature of boss flags or an automation upgrade, or something?
For idle purposes, If I planned to step away but wanted to leave the game running, I could just move the hero left and have him stand at the flag.