PCS2 official releases may be found here: [urlhttp://www.hard-light.net/forums/index.php?topic=77292.0]PCS2 Builds[/url]
Development and maintenance on PCS2 is irregular, but isn't quite stagnent. You can track progress on it here: Contributors to scp-fs2open/PCS2
As far as I am aware, there is not a dedicated team for PCS2. However, since the repository had been consoladated under the SCP organization on github, any SCP member may be able to review and service pull requests. Since PCS2 is open source, anybody can fork the code and submit a pull request.
Compilation of PCS2 involves using Cmake to generate the project files for the supported IDE's. The build process is very similar to what's done for FSO
Do you still have to purge BSP cache before saving the model?
Sadly, I am unaware of any changes that addresses that issue. If you find out on your, would you please let us know? Thanks in advance.