Summary: add function exit point visualisation.
Today I've stumbled upon a method that is several hundred lines long. Its return type is 'bool'. Unfortunately it was renamed by some dev what changed its meaning - think WasReplyOK() renamed to WereThereErrors(). The dev then tried to invert all return statements from 'return false' to 'return true' and vice versa to reflect that change, but forgot about some, what introduced mess. For such refactorings it would be helpful to have a way to visualize (like different background or something) or enumerate all function exit points. I think Resharper already has the knowledge, it's just a matter of showing it :)