Yes, please do delete warnings for slash. It's not necessary to include the author's warnings.
This was my error, above. We mods had discussed a policy on warnings at length, but it didn't make it into the guidelines! It does say, in the template, to include warnings only if necessary, and please not to warn for slash, but that's not very illuminating.

We'd prefer if you only included warnings for major issues. We will have a longer post about this asap.