One of the things that bugs me about the wizard is how non-combat magic is an entirely separate system than combat magic. Here is a very quick draft of a possible ‘fix’ that I thought up about 10 minutes ago:
Prerequisite: Wis 13, wizard
Benefit: When you take an extended rest and you have access to your ritual book, you may choose to lose one of your encounter powers for the day and instead designate a number of rituals equal to your Intelligence modifier as prepared rituals. A prepared ritual must be a ritual that is in your ritual book, it must have Arcana as its key skill, and it may not take more than 10 minutes to cast. Once per encounter, you may use a prepared ritual as a standard action. You may not use more than a single prepared ritual in any encounter.