From my stand point, I have never seen Locktite used on any factory flywheel installation, applying the proper torque value would suffice in my case.
The only down side is if you ever have to remove it. If your flywheel bolts are the shallow head type you may have a problem getting them out if you ever have to. I have seen flywheel bolts that were Loctited in that you had to drill out after the heads stripped off. The shallow head bolts are adequate when applying the normal torque but a lot more is required to remove them if you use a locking medium.
But, like the boys above have already said, if you don't feel safe with your threads bare, then use some additional protection!
One other thing, I'm sure that your aware that there are different grades of Locktite, some is made for a removable joint and some grades are quite permanent, make sure you select the right one.
Denny Graham
Sandwich, IL