I say leave it the way it is. The current method somewhat requires a user to be part of the community for a while (or at least be a lurker who reads) to get upvoted. You need to know 'Show HN:' and you need to write in a non-spammy way. It seems to work and keeps the quality higher in my opinion.

I also like the current ratio of what seems to be one or two per day that make the front page. That's enough for me to occasionally click through instead of going to a separate view and weeding through it.