Its pretty easy to switch that now https://github.com/thomas-mcdonald/bootstrap-sass

CMIIW, the project you mentioned is not really usable for customized bootstrap, it's all-or-nothing.

Since I want to include (customized) Bootstrap into Compass but don't use fancy stuff (variables etc), I simply rename bootstrap.css to bootstrap.scss and be done with it.

Is that really that big of a difference? Besides, I thought most people used Bootstrap without Less. At least I do.