Folders should be available for message handlers created under the Gateway Events. This would be a nice feature. Especially when multiple projects are inherited in chain with more than 2 projects. If a message handler is defined in one of the parent projects it is inherited into the child (runnable) project. But it is hard to see what project the message handler is defined in.

I find it as a good practice to create folders with the project name for scripts, views, styles, etc. which is placed in a parent project. This way it is very easy to see which project that project resource "lives" in. But this is currently not possible for Message handlers defined under Gateway Events.