They do fine if you do that for a game or two, but if you constantly play them out of position their morale will drop by a huge margin and then it's inevitable that they get bad forms. Just don't use a GK for that - keepers must always be in position, otherwise it's an illegal formation.
That's what I've noticed as well - they take a huge morale drop.
re the GK that's not technically an illegal formation, but it DOES have some effect that nobody has pinned down yet.
~^~*~^~ My opinions are best when taken with a grain of salt. No iodine added. ~^~*~^~