Both interesting ideas. I would definitely favor something like this. I want to reward people who take the time to comment on my posts, but I know that currently my small upvote on them just amounts to little more than a "seen" message as the value will go to dust. When I have more VP to spare I upvote comments higher, but after curating I often don't have much VP to spare. So anyway, I like your ideas and I'd support something like this that helped commenters.
I also like the idea for the frontends to separate bot and human comments. That would also fix the problem of all this tip bot spam. Ecency tries to high them, but peakd just collapses some of them. Having a complete separation in both cases would be best.
Usually I just ask the "regular" people not to place those commands on my posts and they've respected it. If the bots themselves go crazy it's also easy to mute them so they don't take a lot of space in the comment section.
At least I think my comment section is quite clean generally from them. ^^