I'd rather not do that because then people will start "bumping" stories by commenting "bump" just to promote their personal thing. I think the answer is more users. The site currently gets about 15,000 page views / day which is already amazing given how little promotion the site has had.
Since the site is open source you can see the front page ranking algorithm here: https://github.com/jgrahamc/twostopbits/blob/master/apps/new...
Any any changes in the algorithm I would suspect as temporary. Measures only to spur discussion and avoid “tumbleweed” posts that briefly appear on the front page and then sink back into obscurity. If the community ever attracted a “cult of rust” like you see in HN that post and upvotes anything Rust. We would have a problem. Such a faction with its enthusiasm would be able to squeeze out anything else. Amiga. Nintendo. Atari. As examples.
Yeah, exactly this. Lazy "bump" comments could and should be moderated away. It would be fine for comments-by-submission-author to not bump a submission in this way.