I dont mean to argue your points really... but I was considering that a player should figure out if he has a level 40 (or 30) Skill ability that is kind of overpowering that he wants to use asap. And if so, load up the bar with that class tree with 3 skills from the line. Then 2 other from his next two most important lines. After popping 40 skill, switch 'em out to more like you are espousing to level the skills. Obviously when you are boss fighting and at important pvp junctures you would go with with the best hotkey loadout (which will certainly include that level 40 skill, even if you are level 19) and not worry so much about particulars. Also you should buy your level 1 key-able skills ASAP in each tree line. Then migrate to your big hitter tree being dominant. Then back to a smarter spread once you get your big skill. I just think that some level 40 skills will be very very strong compared to most lesser skills. (Daedric Mines, Bolt Escape, Ashcloud, Sunshield, Inferno, Cleansing Ritual and Rune Focus, Snipe, Momentum, Force Siphon).