Yip… This is a common request and the devs have confirmed that they are working on a comprehensive update to all the dps tooltips in the game… A quick forum search will give you more detail, but at a quick glance everything you asked for has been discussed…
The main thing about tooltips is that the devs want to make sure that the information is relevant to players while playing so the information they want to display needs to be accurate /useful. This means that its harder to do than what most people think because there are values that are global to everything and other that are local to skills and applied effects and these values might be entirely different in different situations and based on what ailments are on an enemy and what buffs are on the character at that split second…
So yip… tooltips are on the devs to do list… but they might not be done soon…
and, if you are going to want to do theorycrafting level calcs and things, then you might have to consider Dammit / Tunks websites and the Community Game guide for the actual math behind things…