I can Understand the Frustration in Having to Recreate your Rituals, but I agree with Glaistig. It's not really necessary to have a recreate, or a template for Rituals.
From my Own experience I find it's actually Better to Not keep reusing the Same ritual.
1) If you just Set up the same ritual over and over again, It just begs someone to Make a Counter Ritual and keep destroying yours. At MP3 Conter Rituals don't mean much due to lack in Variety of Creautres, but in MP4 and especially MP5 it become Huge.
2) As Lulu Pointed out When a Creautre Upgrades it still exists in a Ritual, but often Upgraded creatures Don't have the Same Targets, or abilities, and sometimes this can make that Creature Unusable in Battle. For Example, I recently Upgraded my Bird, it used to Target Strong Creatures, and it Now targets Multiple. I was reading my battle log, and Realized it was still trying to Attack Strong, and just didn't attack.
3) Well You need to try new things. Having to go through the Ritual creation Process forces you to Rethink Decisions, and maybe try something New. I think this is the main Reason Manu wants Rituals to Die (other than Combo Bonus . It's much like how you restart the Story at every MP level. It may seen tediuse, but it forces you to stop that exta second and maybe think "I'll Try something New"
Having Said all that, I do Think there needs to be a way to Set Rituals without targeting a Player, or at least allow Setting Rituals in a Sanctuary. My worst Experience with this was During the Heads Contest, I tries using the Hour long Shield thing, and found that since I couldn't attack I had no control over my Rituals.