They did the same as chickenbones, you can run WRCRE without RP2 as far as i know. Its simple all you do is get permission from whoever and then you have to integrate the code from the other mod into your code which can really mess things up. A lot of these guys have other things in life like a wife/husband, kid/s, job, etc... so they don't have the time and they most likely would any more then what they are already doing because if you do something for too long you tend to get a little mad and you end up not doing your best.
What I was trying to say was that your original argument was invalid because mods like Applied Energistics can add BC features without BC installed. Same thing with Railcraft and Forestry.