Just select Edit, Key mappings...
In the new window that appears, select New, then Add New: Enter in the new calculation box
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Count=Count+1
Cursor will change to a left & right arrow so then you can hold left mouse button down and drag to the right.
Now you click on the box to the right of the formula, below the Key section and press the key you are interested in.
In this case its the w: Now select Add new, New and repeat above steps adding
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Count=Count-1
Now run the simulator at full speed (will still work if running at a slower speed), pressing the q and w keys: If the value is not changing when pressing q or w keys then try clicking anywhere within flowchart to bring into focus.
Instead of adding a formula, you could just assign a value.
E.g
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Count=10
Martin