What I do about rituals is that I require a character to be trained in the skill of the ritual in order to use it. That creates some nice synergies between class skills and allowed rituals. As written, you don't need to be trained in the key skill of a ritual in order to use it, and since many rituals work more or less the same as long as you roll 10+, many can be used unskilled.
About At-Wills... That is a harder call. I agree some classes (Fighters, Wizards) could sue a greater selection, while others (Rangers, Clerics, Swordmages) would have a hard time finding viable choices. If I increased the number of dailies, I think I would do it by class rather than across the board. Maybe let Wizards apply their spellbook feature to At-Wills?