- Create a web slice
- Insert / Remove the IE8 Compatibility tag
The former provides some template code to make it easy to create a web slice while the latter allows you to identify a document or folder and apply or remove a specific IE8 Meta Tag. While you’re more likely to set the HTTP header if you want a whole site to be affected, this seems like a good way to manage broad changes or exceptions for your site.
Worth a look at least.