I guess it's no HOF mod for me then - glad I hadn't started playing yet. I'll just use the vanilla save. I'd like to have used the HOF mod but if I'm using slavery I do rely on the presence of overflow hammers to save micromanagement. And given the immortal difficulty level I anticipate using slavery a lot to stop the AI getting too far ahead.
I'm not intending to deliberately use the slavery bug in the non-HOF version, but it looks like either way, errors in hammers are going to happen based on circumstances that are too much trouble for me to micromanage round them. I'd rather have those errors take the form of bonus hammers, rather than getting insufficient hammers. The latter could really screw me if I was depending on them.
I totally support the idea of allowing HOF mod, but I guess anything big like this is inevitably going to have problems to iron out. Hopefully next month it'll be fixed and I'll go to a HOF game ...