OK, so you hate quarter 5 and the posibility of a tie.  You think it's not fair when the first team gets the ball and runs down and scores before the opposing team runs an offensive play.  The problem is that the NFL likes the big exciting plays and doesn't want to start the teams at the 45.  Here's my best shot:

Coin flip winner picks Offense/Defense/Wind (probably D)

Defensive team kicks off from the goal line.

Receiving team returns it and runs offense under normal rules.

No timeouts.

First half of OT is over after a score, turnover, or loss of downs.

After first overtime, you have to go for two.

Celebration penalty would be assessed to the end of the return.

Still have big play opportunity via kickoff return or 50 yard touchdown pass/run.  It's more "fair" than the current system.  Personally I'm OK with the current setup, ties throw a little chaos in the system.