Quantity less than 1.0

Hi I installed your plugin and it works perfectly for me except of one issue. Is there a possibility for the tiered pricing to set the quantity to less than 1? Since we are always displaying the 1kg price, it would help to have the opportunity to set the tiered price quantity to 0.1 and increase the kg-price. By default it won’t let me do that. Or is this feature included in the pro version?

Thanks for your help!