Alright, I looked guys and basically we were using an right compass point system as though using an aerial view and north was forward to describe things locations with distances in five foot increments (ie: This person is approximately ten feet south-east of you, a tree is twenty feet north and the BBEG is north-west of you approximately thirty feet). This meant you only had to figure things out in those eight directions and everything lay on a straight line from you. If this was changed due to character movement (I don't remember if it was even geometrically possible) an estimation of five or so feet off usually wasn't a big deal and actual initiative style combat usually takes place at fairly close quarters.
We then used a movement point system in which a five feet was one point, and actions had different amounts of points depending on duration, what would be different action types in 3.x. For example a full round action would use all alloted movement points. A multi-round casting time spell would use twice (or three time, etc.) your total.
Each characters total movement points are determined by character speed based on the five foot step for 1 point rule.
I haven't done the math to figure out what the point totals for different movement speeds and types of actions would be in 3.x but I hope it helps.
I might figure it out for my own personal curiousity as I bet the action system in 3.x was designed like that origianally and then figured into simpler terms.