Two separate ideas
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It might be interesting if we could have new equipment that would allow an extra consumable.
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Or since there are 7 slots between consumables and equipment (4 equipment slots and 3 consumable slots) perhaps we could be allowed to have a maximum 6 equipment slots at the sacrifice of 2 consumable slots and a maximum 5 consumables at the sacrifice of 2 equipment slots. Plus of course the other options in between.
This would allow drastically more customizability and allow some really interesting / fun builds.