Looks like this was fixed.

Verified on devenv_5549 with following steps:

1. Create 2 domains named dm1, dm2.
2. Create applications named myapp under each domain dm1, dm2.
3. Control one of the application via domain name and application name.
4. Control the other application via application name and gear uuid.

# rhc apps -s
  myapp http://myapp-dm1.dev.rhcloud.com/
  myapp http://myapp-dm2.dev.rhcloud.com/
You have access to 2 applications.

# oo-broker oo-admin-ctl-app -c stop -l lxia -a myapp -n dm2
Success

# oo-broker oo-admin-ctl-app -c start -l lxia -a myapp --gear_uuid 557e9f6b2871472583000019
Success