This isn't a bug so this isn't the place to discuss it. If all you want to do is try and get a bunch of +1s for the idea, post your use case to -general and see who else agrees with you. But I don't see it being very likely that this particular limit goes away. Especially if the last reported request is from the 8.4 days of PostgreSQL and you aren't offering a patch.
A staging table that isn't built from scratch each time isn't a use case I'd be too interested in spending significant effort to handle. And a test harness that doesn't have an initializer to build out clean first-run tables on demand falls into basically the same category.
