Cashless payment and cash payment at the same time

We using the CashInterface v2 from casino-software.de what you official recommended on your website for years. We using the bill acceptor NV10. The software will send a keystroke to start the payed session. Since you released cashless payment with stripe, you didn't gave a opportunity to use both at the same time. Why you don't give us a opportunity to use the CashInterface while cashless payment is activated? (Keystroke F13 for example)