There are specialists available for these tasks. Many advertise their services on the Shopify Experts directory as it is a great place to find vetted, experienced developers.
Of course, we're always happy to receive emails relating to any question at all and will do our very best to advise in any way we can. The team try to keep within a scope of support, as customisation can be tricky to get right.
At present, we cannot offer code customisation services out to merchants. Instead, we advise merchants to seek specialists or experts for these tasks.
We offer support relating to core app functionality, such as admin area settings and the app's updates only. Any code customisation outside of an app's core functionality could have ramifications across the entirety of your site.