This sounds like an interesting idea.  I think that can be done pretty easily.

This would be particularly useful when there are dozens of subroutines and functions in a single module and implementing a search and replace of text.  For example, if one only wanted to replace a variable name in one particular subroutine, currently it's unclear whether you've replaced the text only within that particular sub or corrupted the adjacent sub where the text should not have been replaced.  By highlighting the sub/funct name in the file/outline list you would know exactly where you are in the search/replace operation.

Frank