Aphrodite
speed=pps-0.5^dt
At this point I'm not even sure if thats the proper formula.
It would:
A: Simplify things for non coders, in an engine made for non coders.
B: Get a decent approximation of pixels per second without having to guess.
To be honest I have a hard time remembering every little trick without writing every formula down.
When we didn't even have lerp I looked "x = A + t * (B - A)" up, just like anybody else can.
Don't even get me started on anglelerp(), or distance(), or angle().