It is still not very desirable to have the anti-warp use the same adjustment interval as difficulty.  It should be much more frequent to be most effective.

It should actually be shorter than our confirmation/maturation times, otherwise it offers less security than it could/should.  (If it is greater than our confirmation time the protection it offers from warp based attacks actually decreases around the difficulty re-target blocks, and maximizes at the odd 1000 intervals between targets, it seems.)