Hello,
Thank you for your feedback.
1. Unfortunately the position where stuff is presented on the page is the concern of your theme, not the plugin. Therefore it would not be easy to position the crypto selector UI elsewhere.
2. Yes, it is possible to only show coins with sufficient balance. This makes sense and I will add it to the next release. Thanks.
3. The WooCommerce Gateway extension does not currently work with multi-vendor plugins. This is in the future plans but requires a lot of work and will not be out soon.
kind regards
P.S. In the future, could you please open one thread per issue? It makes tracking issues easier for both of us. Thank you!