Our data goes back to the first block of main net 1 back in Oct 2020.
Yes, to request features we have a channel dedicated to this in our Telegram - https://t.me/FindLabs
You can also follow our planned and delivered features over on our roadmap - Flowscan Roadmap
Yes! We have our Flow Simple API available on Quicknode.
https://marketplace.quicknode.com/add-on/flow-simple-api
If you would like early access to the full API please reach out to us on Discord (https://discord.com/invite/findonflow)
We welcome feedback and suggestions in our Telegram - https://t.me/FindLabs