Buy Button channel

I am using this to show my products on a custom Wordpress site I built. The core functionality is solid, although there are 2 things I would add.

1. The ability to redirect to Checkout in the same tab. (I had to mess with the code of the buy button for a while too figure this one out. I was able to accomplish it but it would be much nicer if it was an option like in the sidebar when creating the buy button)

2. Since I do not have an actual strorefront on Shopify (I own my own domain) when users are redirected to checkout the url changes to my shopify store url. I would rather have the url stay the same because if someone inputs the shopify store url into their browser they will get the blank default theme. If I switch to the Shopify Lite plan then I loose some of Shopify's functionality and plugin ability (Most notably Kit)