Need wordpress customization on YITH WOOCOMMERCE PRODUCT BUNDLES

please see plugin https://yithemes.com/themes/plugins/yith-woocommerce-product-bundles/ , need someone to customise a few elements on the plugin , firstly i need to be able to have 0 items, it has to be minimum of 1 should be set to 0 so will need some plugin customziation

secondly i need to have ajax calls showing when customer goes over the number or product hasnt had all items added.

to make sure you have read through everything please put at the top i will customize it 100% , budget is fixed at 15usd any over budgets will be declined