No, the plugin does not support decimals for points, so it is not possible to assign decimal points (e.g., 8.5 points). However, it does support decimals for monetary values. For example, you can apply a $35.50 discount when redeeming 100 points.
And the good news is, you can choose the rounding of the points your customers earn, either rounding up, down, or to the nearest number.