With bug 1090949, Simulators become configurable in WebIDE. However, sometimes we know that certain configurations will be problematic or simply won't work. It would be nice to show visual feedback, e.g. when: - The user chooses a custom B2G binary, but no custom Gaia profile (simulator will fail to start). - The user chooses to emulate a special device type like "tablet" or "TV", but didn't set a custom Gaia profile (simulator size will be correct, but the default phone-specific Gaia build will look weird). - The user enters bad or impossible values.

WebIDE is slated for removal (bug 1314811), so there are no plans to add to the current set of features.