FL Studio or Fruityloops as it was once known.. does let you change the tempo/bpm to the fraction. Look at it...it's default tempo setting is 140.000.
Hover your mouse over the ".000" part and you will see an up/down arrow mouse icon. Click, hold and drag the numbers to your desired tempo.
So, for example, 98.8 bpm... will be 98.800 in FL
