Mountable Apps and "-T" option

While I was starting to play a bit with mountable applications, I usually pass "-O -T" on testing applications or plugins.

Then I found that it is not possible to run "rails s" on a mountable app if "-T" option is provided. I think this option should still generate the dummy application under test, don't you agree?

Maybe we should have a separate option for skipping the dummy app when desired...