The OP suggests a way to automatically set prices to say -5% or +5% of the "TG price"
I'm not too sure about this as it could freeze up the whole free market idea as the shops would look at the average player price and players would look at the average shop price.
### Feature:
- mass set prices for every item in the shop as an offset to default price.
(like: +5% or -10%)
- allow setting by category
(Prices stay as set, they will not update on a change of the default price, so its only a mass-set feature, not making them dynamic.)