My action system have you roll 2d10+ initative bonus. (0 is rare, but possible for "regular people" with average stats and no combat experience. 5-10 is more common. 15+ starts to get rare again)
The result act as initiative. You get to act on that result, and then it goes from highest to lowest.
But each action Costs about 5 action points. And you have as many action points as you have initative. Other actions can cost everything from 1/2 per meter (running, 1 per meter if walking, to 10 for longer actions). So if you have action points left, you can act on the new Initative score. Once youre down to 0, you cannot spend any more points, naturally and so your round ends.
But while you c