Designing new rules variations for D&D is pretty much rearranging deckchairs on the Titanic :)

Not at all. The system in question is quite adaptable.

Scarey, huh?

It shows the resilience of the program. TP is very fast, the code is clean to read and easy to write and from what I've been told, Lazarus (the Delphi-like RAD) is damn good as well.