Just a suggested setup for creating your engines,
What Ive done is set the debug display so that the engine variables can be adjusted by clicking on them with either the left, or right mouse buttons,

if you are having trouble getting that value you want, or its just taking too long because you are closing your application to set another value to test, this idea can speed things up dramatically.

the effects on the engine are immediate,
so, rather than having to close the application, edit the value, then reopen to test it, you can just click, and test.

when you find the value that you need, you simply write it down, and then set it in the editor.

BTW, im aslo using this for my fangame, The twisted dream

I like this idea a lot - it would've made testing the physics in ROTW so much easier. I wonder if Dazzle could implement something like this in the platform engine he's been working on lately.

well, its really not that difficult,
You just lock the values for your current engine to global variables.

the rest is working counters.