Run a plan on several agents

We are willing to move from Hudson to Bamboo but it seems impossible with the latter to say "run this plan on the agents A1, A2 and A3". This is absolutely necessary to test our tool on various platforms and OS.
The only solution is to clone the plan and tweak the requirements and capabilities of agents and jobs to force the plan P1 to run on A1, P2 on A2, ... This is extremely inconvenient. Moreover, next time we want to modify our plan, we will have to modify 3 plans (in this example, but 30 in our system) instead of just one.

Without this feature, we just can't move to bamboo.