No developer hacks with open data any different to non-openly licensed data. So if you follow this argument through, you should avoid discussing any developer techniques.
But that seems stupid. There is a reasonably well-defined activity of data hacking/wrangling, which is having a big surge of interest because of all the open data being released right now. Having a forum to discuss how to best to approach badly formatted CSV files, merge multiple datasets together, how to convert to linked data, techniques for mash-ups on maps, ideas to produce cool visualisations etc. is valuable. Creating this new site and community around this activity has value that you would have say with a tag on StackOverflow, even though there is a bit of overlap. I'd rather discuss how to deal with that overlap, and that might mean carefully writing the scope.
The other sort of questions seen on the site - asking about finding or dealing with particular (open) datasets - is valuable too, but I think it would be a far less interesting site in general with just them.