Hi,
Thanks for your feedback !
1. This feature is already in our TODO list and we already start the development. It is something planned for the next (big) release: 1.3.0
2. Good idea, I put it in our TODO list.
3. I will check if the return url works good for the product page in the backend.
4. I think you are talking about the "filters" feature in HikaShop Business.
Best regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.