Decimal value not allowed?

Hello,

Firstly thank you for your contribution.
I am trying to set this up on a site, the only issue I am having so far is I don’t seem to be allowed to enter a decimal percentage?
Payment fee on Stripes are 1.75% + 0.30c .. I can get away without the fixed part (although it’d be nice to have it as an option too).
But I can only set it to 1 or 2 but not 1.75%?

am I missing something?

Thanks again for your time 🙂
s