slider is not the best way to load rations on the ship

[grävling]

Since rations (according to cyrus) fill your ship in multiples of 6, I am spending a lot of time trying to have exactly 30 and not 29 or 31.
Some additional buttons (+1 -1) to supplement the slider would make the job a whole lot easier.

[moody]

How about two other options. One would have a button with +6 on it, so that you could load in multiples of 6.
The other would be to designate how much of your hold to fill with rations, then press it to reach that number.