Sweet! 
Ya good point. I’ll keep this in mind. We do have this newish topic about Creating consistent admin interfaces and I think some improvements to the rss-polling plugin will trickle down from that. Likely I imagine we will create a separate edit screen like we do for other plugins rather than editing things inline.
Yes, thank you pointing this out. I can see how this is confusing. “Feed Settings” is a label for the first two columns indicating that those columns affect the RSS Feed. The “Discourse Settings” label is for the last 3 columns indicating that when you modify them they affect things in Discourse.