I would also like the ability to include these text regions in spell checks.

I am assuming the creator of this issue is referring to // and /* ... */ comments.

Yes I agree. Spell checking for Inline comments would be very useful.

I made a quick hack to get this feature working. It simply allows more token types to
be sent off to the Spell String checking process.

DaemonProcess.cs 5.8 KB   Download

Thanks for the hack :)
The problem is that there can be parts of code commented out (with xml comments, 
escaped strings etc.) and I want Agent Smith to be more or less smart to detect them 
or at least to show as few errors as possible.

It would be somewhat hard to implement this because you'd need to run the commented
content through the lexer parser again to see if it were c#

As a work around you could do two things. The first is to use the enable disable
comment feature of again smith to skip such code areas. The second is you could
modify my hack and remove the CSharpTokenType.C_STYLE_COMMENT (/* comment */) and put
your comment code in side of this style of commenting.