Hi, this is a friend of Farsthary.
As you may know, integrating the simulator inside Blender is a tiedious task which requires deep understanding of many concepts. Just as an example, it has taken a whole summer to Nils Thuerey to integrate his fluid simulator inside Blender (thank Google!). Daniel Genrich, father of the cloth modifier, has been improving the integration of this simulator and also its speed (OpenMP). He has also been working in unifying/improving all the physics tools, becoming thus the responsible of the new sim_physics branch heavily updated by Matt Ebb and Farsthary.
Matt and Farsthary are currently pretty busy with work/2.5 developpement and study/researches on volumetrics respectively. Daniel Genrich is also making a “coding pause” for researches, but he has previously stated that he is very interested in integrating the smoke simulator inside blender, and this would be really appreciated by Ton for realistic VFX in the next open movie project (Durian).
Remember that adding a whole new feature might exceed the time span allowed by an open movie project (the micropolygons integration project wished for Peach (QDune) was dropped because its integration was too time-consuming, and would have threaten the creation of vital features). Moreover, the addition of new features was often possible because they were under heavy developpement before the start of the project (eg: the new particles system from Janne Karhu). Finally, a experienced blender developer is required to precisely follow blender coding conventions, and to think about the integration with the other physics tools (wind, obstacles…)
For all these reasons, one should support the integration of the simulator right now and Daniel Genrich is the guy for that, so if you are eagerly waiting for smoke/fire simulation in a near future blender version and want it heavily tested/optimized in the production environment of the next open movie project (in less than 6 months?), just tell Daniel how happy you will be if he implements this and if possible give him a donation (paypal) as a sign of consideration (remember how dedicated he is to the blender community, he has worked relentlessly for the cloth project )