Incrementing by decimal values acting weird

Wondering if anyone has encountered this problem and what you did to fix it:

When I try to increment or decrement a variable by .1, it returns .1, .200, .300, etc. After the first inc/decrement, the decimal places will extend to however long (in pixels) I have my displayed variable text set to. So if I start with a var which on the screen looks like: $$PrimaryRate$$, and extend the text box out beyond that text string length, then set it to 1 and then use a button to consecutively increment 1 by .1, it produces something like the following values: 1.1, 1.20000000000, 1.30000000000, etc. I tried just shortening the text box to hide the extra decimal places, but that only works until you hit the 10s. Then you lose the decimal place due to it being covered up by the short text box. It gets worse as you go up by more places.

I think what is needed is the ability to specify the decimal places allowed for a variable (set to 1, 2 or 3 places usually), similar to PDF form field values, but I don't see that setting anywhere in CP8 (my current version). Am I just missing that?

Also bummed about variables not displaying my chosen font, but that's another thread here somewhere...

Thanks,

Alan