Separate Node Author & Comment Author as Filters

As either a regular filter or a contextual filter, I see no good reason why these two distinct pieces of information are conflated:
If I want a view displaying all pieces of content written by Alice, that doesn't mean I also want all pieces written by Tom, Dick, & Harry, merely because Alice commented on them.
As a contextual filter, I may want to see pieces of content I've written (or not - see http://drupal.org/node/1247020 = my actual use case), and not have them combined with pieces that have my comments (or don't).

Thanks.