The National Ferries Company Website has an update at http://www.nfcoman.com/.
Although the website seems to be currently under construction, the temporary homepage gives essential contact, schedules and tariff information. I notice a small concession for Khasab-residents one-way fare. Interesting!
They have a toll free number 800 72000 and email contact email@example.com which I remember being published in various media earlier.
We might have to wait a while to book online, but I found the folks very supportive and informative on my direct interactions for a sun-set cruise. Thanks.