I wonder whether D6 still accepts this sort of thing or not...
Remove the "Add new comment" link from node-teasers. Because I know that some would dislike such change, i propose to make it configurable.
The link to add a new comment directly from teaser is no-good for me (speaking of my real site) in both the cases:
--- Anonymous user see the notice "Login or register to post comments" on every teaser. Given that my frontpage shows 10 promoted teasers, and the notice in Czech translation is even longer than original ("Přihlašte se nebo zaregistrujte, abyste mohl psát komentáře"), it's spamming the frontpage a lot and looks silly. From theming perspective, there's also quite too much in the links area.
--- Authenticated user (with matching role obviously) see the "add new comment" link, which is senseless in my opinion: There's no point to encourage users to comment on nodes they didn't fully read yet. Commenting after reading only just the teaser is not a good thing, for quality of the posts. Additionaly, also this link is a little long, and might be considered as kind of spamming the frontpage (which I always prefer to keep clean of unnecessary items).
I just added the necessary condition, along with matching variable, and admin-settings form subpart, being careful to keep the style of already existing code. It removes only just the "add" link, other links (like comment counts) are not affected.
Additionally, I changed one comment, where it said "Main page: display the number of comments that have been posted." Actually that code-segment also handles the "add new comment" link, and applies to all teasers (including Category & Views lists and more), not only just "Main page".