I just started using your fork of scons and I appreciate the effort.
There are a few issues I will report. I definitely would like to see scons build and link both c/c++ objects files together with D, so for that reason alone integration is a good idea imo. Integration is also a good idea for another reason, simply to make using D more convinient and to better ensure that the support tools are visible and kept up-to-date. The most significant barriar to entry is the lack of properly supported D tools and documentation. -rt