Reported by chrysn, Feb 6, 2012

tallyphant gets hard to use when large increments have to be used; 
the add button has to be pressed repeatedly, and doing larger 
increments requires doing the maths manually.

i suggest the following addition:

there should a preference for the "button mode". a button 
mode describes which buttons are available, by how much they 
increment and how they are labeled and aligned. by default, there 
could be:

- single step: -1 ("-") on the left, +1 ("+") on 
the right (the currently only mode)
- decimal: -10, -1, labels, +1, +10
- quick: -1, labels, "any", +1

(the "any" button should open a dialog where an increment 
can be entered using a digit input, optionally prefixed with a minus 
to decrement. that dialog should also take simple mathematical 
expressions, like multiplications.)

a further extension might be to make the button modes configurable 
for particular games.

the use case that made me stumble upon it is scrabble, where i need 
to keep a score, but increments are typically like 16*3 + 5.

the back button should always provide undo, as the increments can 
not necessarily be easily reversed.