Of course they can change it if everyone later agrees to change. It's just not worth discussing right now because it will only cause confusion. It's more important to rebuild the momentum lost when Mintpal listed it just to screw with everyone. The price was rising very well on it's own before that but Mintpal do like to screw people and this way they screwed URO and VOOT.
Mintpal is just a terrible exchange anymore, it's bot infested, the order book needs to show more to give an honest market valuation of a coin, I also think the owners manipulate things on the backend for their own benefit. Personally I hope Bittrex takes over because it is proving itself to be a solid and less toy-like exchange.
I think the reason there is no volume on URO on Mint is the day traders with their bots are finding themselves unable to exploit a coin that is scarce and that for the most part no one wants to dump. Some people find this lack of volume worrying but I think it's encouraging. I'd be fine with URO going sideways until the 9th.
Your statement is not correct. Unless Mintpal has released their API version 2 to the public you can't trade with bots. API version 1 only gives you information. They only thing that mintpal did to hurt Uro is release it to the market on a Sunday, which is typically a down day for any coin.