Store Bamboo build plans in code repository, with the code

Sometimes, one needs to change a Bamboo build plan for a repository, as project development is progressing, etc., in a way that effectively breaks building on older branches.

This makes it hard or impossible to re-build old branches, that depend on an earlier version of the Bamboo build plan.

Wouldn't it be really, really cool, if Bamboo's build plans could be stored in the code repository, so that the build plan of a project is always kept with the project?
This would make everyone able to re-build old branches without manually changing the build plans (and changing them back, when done) - an error-prone practice.

If anyone knows of another way to 'fix' this, please inform.