If you back the seat/crimp die out further, it won't crimp at all. The seat/crimp die crimps as the bullet is being seated. There could be an issue with this if you don't hit the cannelure just right.
Some people will tell you they don't much like the FCD as it can resize a lead bullet since it is designed to resize the base of the shell to max SAAMI specification as a final check. This can lead to a loss of bullet tension or leading in a barrel. I don't use the FCD for straight wall cases so who knows how it will work for you.
If you wan the FCD to only crimp and not do a final resize check on the cartridge, you can knock the carbide ring out of the bottom of it. I suspect that would void your warranty.