Turn of Combat Reformulated - Velocity

[Anthony]

A method I've seen in a small number of games (mostly not RPGs, though classic Feng Shui had a variant on it) is by having a fairly high granularity initiative track, and every time you take an action you move your counter forward by the cost of the action; once the timer reaches your counter, you're free to take another action (video games may use something similar to this, where taking an action puts you on an animation lockout, but they usually also don't have instant activation). This allows you to do a number of things that are quite hard to do in a one action per turn system -- not only does it let you have characters at different speeds, it lets you have characters have different speeds when taking different actions -- but it's significantly harder to use than regular round robin initiative.