Peakmonsters - Rent out feature request

I have a feature request for Peakmonsters. I'm not sure whether this is the right place to put this but I hope so.

Sometimes I wish to rent out several of my cards at the same time. Here I have chosen "Venari Heatsmith" and "Exploding Rats" as example as seen below:

Is there a way to either add a certain amount of DEC or add a certain percentage to each rental price? For example, I would like to be able to add, say, 0.1 DEC or 10 % to the rental price of every card.

I know that the "bulk price" option exists but unfortunately the lowes possible amount to add to each card is 1 DEC. For example, if I attempt to add 0.1 DEC to each card, this is what I end up with:

Of course, it's absolutely possible to set the price manually but sometimes I want to rent out a lot more cards at once. Setting the price manually for every one of them is a bit cumbersome.

Any help or comments are highly appreciated. Maybe I just missed an option and this is pretty easy to solve. If not, please consider this a feature request, developers at peakmonsters. ;-)