In order to make use of this plugin in my CI I need to be able to block the build before it consumes a slave nodes executor. The reason for that is that I have a large number of Matrix combinations that compete for exclusive access to shared resources, spread across multiple Matrix jobs.

Example:
Matrix A: Browser X Server (Jobs runs on Browser)
Matrix B: Server X Agent (Job runs on Agent, needs to lock agent)
Matrix C: Browser X Server X Agent (Job needs to lock Agent and run on Browser)
Matrix A and B can run in parallel without coordination in my case, Matrix C however needs to coordinate resources with both A and B.

Currently Matrix A and B exist and manage resource access with only a single executor per slave, this won't work for Matrix C however.

While my requirement could be fulfilled already by adding lots of executors to every slave that would make my Jenkins installation quite unclear