Current behavior

If a user is interested in running a specific, perhaps target language-specific even, custom QA check only, they'll still have to select them all by clicking on Custom, as the full list is not displayed.

Requested behavior

If a user is interested in running a specific custom QA check only, they'll select it from the full list of custom check that is displayed in the QA tab. This is particularly useful because target language-specific QA checks are not supported, and this would be a viable workaround.