I fear there is no chance till UBB Thread introduce this feature.
I was so silly to register me at a german forum with the same software it's all as ever.
I can't still believe that I (as topic starter) get only a notification, when I think on the check mark after each posting, and before Yours, I didn't. Why it is possible to set an instant check mark reg. the Signature and not for the Notification ??
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I refered this thread to UBBThread and hope they improve their features.

You don't need right click to see typos with this for IE
it shows typos in the same way like word shows typos (with read underlines), then You can correct it via right click
The extension for Firefox work by the same way