Trading items

Their should an option in the shop where we could exchange stuff like power cells which r useless for gold or parts, or may be change gold to sugar and vice versa.
Or instead of scrapping an item, lets say a rare cannon, the shop has some items which you can barter trade your cannon for, lets say you give your cannon for a blast cannon etc.
This can be controlled the way perks appear randomly in the shop and so u cant trade an item until what u want appears in the shop.
Thank u for reading this long explanation

 

I like it, I personally believe that letting us choose what we want makes us specialize more and overall makes the game more fun.
#All I want for Christmas is another epic sniper cannon