Why are you a mentor then?
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Harsher Penalty? No
How about increasing the XP from Castrum? Yes
If someone wants to take a penalty that will last longer than it takes to clear the instance, that's their choice. They're also risking it will come up again when they're able to requeue, wasting even more of their time.
I have yet to see a Castrum group have problems just because 2-3 people ditch at the start. As long as there's one tank or one healer the group can still clear trash going down the hill as the group gets refilled, though at a slower pace than with both tank and healer still part of the group. Usually the group has refilled by the time you reach the bottom (unless you're playing extremely late at night or early in the morning). I've even cleared it in a group of 5 when the player left with party lead didn't want to requeue the group and deal with possibly more whining from whoever ended up joining. It didn't take that much longer since so much of the instances is still just running around as you get interrupted by cutscenes.
It's not a big deal. Don't stress over it.