[development] making 'read more' themeable?

Has there ever been discussion of making the "Read More" link themeable? The node_link() function adds this link with preset text that can't be edited. This can be a problem; For instance, I often need to add an » or arrow graphic to the end of all my site's "Read More" links, or to have the link's "alt" tag read something other than "Read the rest of this posting." There's currently no way to do either of these without hacking core. (My non-core-hacking solution on a few sites has been to use CSS: ".read-more{display:none;}", ugh.) Would it be a worthwhile DEP to replace this line of node_link() with a call to theme("read-more") or something similar? =T=