I'm not sure I'll do it, but that's my answer for almost everything at this point. Ultimately this is why I'm taking the strategy I am - plugins will be able to do anything I can do quickly and efficiently. Integrating a step-wise debugger won't be a completely trivial amount of work, but I'd be surprised if it took more than a few days and it's something anyone should be able to do :)

After 0.5, my goal is to remove us as a bottleneck as quickly as possible and then who knows what'll happen :D