Currently Play find all play.plugins files from classpath.
It can cause several problems:

1. There may be duplicate play.plugins files.
2. These files may contain plugins that I don't want (for example, 450:play.db.Evolutions).
3. It's hard to get overview of the total list and order of plugins.

As to me, it's more convenient and safe to have a single play.plugins file that contains all plugins.