Adding space in category meny bar + separate RSS for separate categories?

While I'm at it - here's another few questions:

The links in my Category Menu Bar look very cluttered, and I would like to separate them - simply by adding more space to each "button". How/where can I do that...?

And - I would also like for my readers to be able to choose, whether they want to follow the whole RSS - or just pick the RSS for the category they are interested in. Today I have this separated into several different blogs - but it's such a mess for me to keep up with. Is this possible? And then - how would I do it...? I don't need fancy design-solutions for presenting RSS-icons on each category-page, if that's a problem - but I would love to have the functionality of separate RSS-feeds.

Thanks again!
//Jenny