Basically, the title.
We all had been in a situation when you hunt for a particular level, and then miss it.
But what if we could spend some of the unused minerals to remedy the situation?
For each gate there would be one mineral that speeds up the level changing, one - that slows it down, one - that reverses it, and two that have no effect.
Of course, it would also create some potential for griefing, but I think this would still be appreciated.
Really, if minerals were at all returned to being used to mess with the Arcade, it should only be the two minerals that aren't used as pet food; meaning Moonstone and Valestone.
Maybe have one of them speeds the level changing and another that slows it down, but involving the other minerals just seems like a bad idea.
And even then it's not super needed, you can still always wait at the elevator for the level to change. Really I only see speeding it up being useful, slowing it down would require you to actively look at the gate map while on the level directly before the level you wanna be on, see that its currently there, and then somehow pump minerals into the gate to slow it down.. somehow? I just don't see slowing it down being helpful at all, considering the level switching isn't as simple as it looks. Levels will swap positions, and sometimes it'll skip one level and just completely go to the next one in line for example.
And where would you deposit these minerals anyway? You can't really do it in the Haven Arcade area because you'd really only find use in messing with level change timings when you're already there, but I can't exactly see just randomly *using* them without a dedicated place to do so.
Everything else involving minerals is pretty specific about that; the old Arcade had specific mineral deposits, you can only use minerals to craft petfood at certain alchemy stations, etc.
tl;dr I type walls, I think the idea wouldn't really work or be needed.