Re: Homerule 4.0 PEACH
The system is based on the assumption that +1 means as much to a 30th level character as it means to a 1st level one. The scaling bonus seems unnecessary. Not to mention exploitable. I see high level wizards punching weak enemies, so they can have a better chance unleashing their daily later in the day.
Having said that, I get what you're going for. If luck is against you, an increasing bonus to ensure that you don't spend the whole combat whiffing is a good thing. I'm pretty sure there's a weapon enchant in AV1 that does just this; every power used (remembering that basic attacks are a power) that doesn't hit anything gives you a cumulative +1 to hit. Capped at the weapon's enchant value, resets after you hit with a power or you take any sort of rest. Turning this into a universal property of all magic weapon wouldn't be a bad houserule. Your bonus scales with how many turns you spent frustrated, while the ease of wiping out accumulated bonus makes this trickier to game.