Rune selection in champion select needs serious work

I don't know how many times I've gone into a game with the wrong runes, because the page "wasn't saved" despite me spamming the save button. I typically have one rune page that I change depending on who and what I'm playing rather than having presets. Between helping my friends pick their champions/runes to go into certain matchups and waiting for the enemy to pick their champions so I can pick runes around the matchup, I don't spend the entire champion select phase setting up my runes page. This past game, I misclicked and so one (1) of my six (6) runes were not selected. Riot's decision on this matter? Revert the entire page.

Why not just select literally any random rune in the row that doesn't have one selected? I would much rather have a situational minor rune that isn't particularly relevant to my character, such as Revitalize, than completely changing my rune page back to a very situational keystone that I previously had on and going into a game with Glacial Augment.

This has been happening consistently since Runes Reforged started, and I'm honestly not sure how something hasn't been done about this yet. Something as simple as what I mentioned above, replacing unselected runes with a random one in the row, could be a simple band-aid fix, if nothing else. Another option would just be to increase the amount of time after all champions are locked in by 10, maybe 15, seconds. With how long the client takes to actually respond to user inputs, this isn't all that infeasible between selecting runes and skins.