If you don't use your fibb tool much, (save your settings as a template first if you do) or for just a quick check to see if there is enough reward for the risk in the trade, you can set up your Fibonacci in increments of 1 (2.5 is 1:1.5)
Do this as far as you like. You can extend lines left or right to check if the R Ratio you are looking for will fit this market...