Also none of the skills mention what they're required for or what they themselves require. Which, for newbies and regulars alike, makes it difficult to know what the hell is needed for what when you're looking at 1st and 2nd class skills if you're not really familiar with your class.
Since they're on different tabs they can't show what they unlock like they do on their own tab. The best it shows you is that SOMETHING from the the 1st class skill tab is required for the skill you're hovering over on the 2nd class tab (by highlighting the 1st class tab) but you'd have no idea since it never says anywhere in skill descriptions. So, unless I'm missing some kind of trick to get it to work properly, RMS is a big help.