Just write a note near every link to the map You fixed:
map_name - original_project_author_name
to have it clear who created it and for whom all greatings belongs...
Some maps even have baddly inserted spawn points (too close one to the other) and I had to fix few maps for this. Who can be mad for this? Maybe we can hosts such maps at BU in filebase (but with the note like I wrote at beginning of this post)?
[EDIT]
@Austin - do it and if someone will have something against it (he will bother You), just redirect him to me, I'll talk to him.
[/EDIT]