I'm not sure if what I use is from a companion, a home-brew, or both. I went to just d10+(QU bonus/5). If multiple combatants have the same initiative, those acting where they stand (as opposed to moving across the room) go first, and among those, the one with the higher QU bonus goes first.
The part that's definitely home-brew is that I allow a combatant to act before their rolled initiative. For each segment they advance their action, they take a -10 on whatever that action is. That's in addition to melee penalties for having moved, etc. So far, in three years of using this system, only one person has used this rule, once.