can we set dns on ipv6 from web gui panel. And will that dns have its unique existance. Can i dedicate ipv6 to website? Will in both cited cases reverse ip lookup show only those website which are assign that dns or ip?
yes Yes. just dont choose a ipv6 ip. reverse lookup will show the hostname / domain that you specified in the ptr record of your ip. The 2 cases you mentioned above are not related to that.