Give it some time, and I bet someone will end up making an autofixer (heck, maybe I will). All those steps are pretty easy to be done in an 'automatic' way.
Funny you should say that... I've made one

Does more or less as Mr RS described, only I'm not clear on exactly what the following means:
If any BGCtrls use these, make sure to halve the values there as well.
No doubt I'm being dense, but what's meant by "these", and which values exactly? I don't have a huge number of stages to test with so an example of a stage where this applies would be good.
Anyway, the tool in its current form is available
here for anyone interested. Put it in your stages folder and run (all modified .def files will be backed up). Run from the command line to get a bit of output on what it's doing. Feedback appreciated
