-1 boost button please

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The idea of stacking boosts is great. However the current interface is pretty awkward, at least as long as I have not just the 9 regular but ~18 old boosts to pick from.

While using the same contingent is simple, changing from battle to battle -- what is IMO the original idea is a hassle. But it would be way simpler if we just had a -1 boost button similar to the +1 one (I'd place it above the boost so it would resemble spin control) that is obvious way to remove boost entirely and oscillate the amount.