As I mentioned before, each forum is configured differently. vBSEO had a lot of switches and many configuration options.
You have to look at your 404 errors and devised your own rewrite rules...
These are only examples from our work (as mentioned before).
Your must look at your 404 errors and devise your own plan.
- Set up a test forum that mirrors your live forum.
- Look at the access.log in your live forum for 404 errors.
- Take those 404s and feed them to your test forum.
- Experiment with rewrite rules on the test forum until you are happy.
- Repeat for all 404 issues.