We have an updated /shop to implement in the near future. There will probably be more slots added as well.
Firstly, I'd like to ask you guys not to tell me that I shouldn't bump old threads like this. This thread is old but still relevant. Secondly, I'd like to explain how I came upon this thread. I was searching for the first thread on the website. I just found it. Now, to keep this on topic: I like the idea of 12 slots.
Anyway, on-topic, I think some maps should have more while others should have less. Or what Juan said of having more on Sky Wars 2 and less on Sky Wars.
It's actually allowed if the so called "bump" is relevant to the thread itself. In this case, its not considered a bump.