Why does Summoning only get a constant 1.1x bonus?
The "time displacement" for summoning is a whole factor more than any other
skill. The charm gathering forms a large part of the training activity. This
time cannot be modified in any other way. (You can only collect charms
yourself)
The uniqueness of this training activity, and the exceptionally good
constructive feedback, meant that we felt it was a skill that the full bonus
might not be the best way of adding to that activity.
All the other skills don't have that "front loading" of time. That's why we did
Summoning only.