Tridge was kind enough to merge his new APJ Tool into master today. This allows you to bake default parameters into any firmware file. This totally eliminates the need to bake vehicle/project specific parameters into the build. You can grab the px4 file (for example) off the firmware server. Run the APJ python tool on it, and bake a parameter file into it. Super easy, took like 2 minutes to setup and use with no prior experience.
In the above, I took a PX4 file and baked in my solo parameters file into it. Loaded the firmware onto my solo, and I now have ArduCopter 3.5.4 with the Solo’s defaults instead of generic defaults.