Specification / videos / other information would presumably be custom product fields.
You mention tabs - on the product admin screens? The idea occurred to me previously that the product information on the admin screens could tidied up and organised better using tabs especially if you have a lot of custom product fields - could be done as a custom template, but then only the shop admin sees that screen so maybe not worth a lot of effort.
On the customer side then again using the Joomla template system (changing code in Hikashop / Display / Views) would allow you to organise this information using tabs and would maybe be a better use of time.
