Well that will determine the perfomance of those jobs. I dunno how the behaviour is going to be with that. So Gladiator for casual stuff (fully cross-skilled) and the paladin (no cross-skills) for hardcore stuff?
I doubt SE is going to drop the cross-skill stuff on adv. Jobs. They rub their nipples on that "on the go" class change, equip every skill stuff :O
Maybe 1.19 will have a slight sneak preview of what to expect with 1.20. But since 1.19 is coming in mid-september thats still some time :O