Starting A Build Defn across all supported Build Engines

I have a single build definition that has multiple supported build engines. When I request a build against that definition, the build is only actioned against the first available build engine. Is there a way to have this done against ALL available build engines?

For example, the build defn Nightly.Build includes 7 build engines, one for each of our build machines (both UNIX and Windows). We want to simply do one click and launch that build across ALL defined (and obviously active) build engines/machines. Right now it looks as if we have to create a separate Nightly.Build defn for each build engine and kick off each one separately.

Any help is appreciated.