Hi,
You can override the entry views in the HikaShop backend.
The view "entry | form" display the "add an additional entry" link.
When the cart goes in entry mode, the user could not modify it. It should use the entry system to edit the values but it could empty it in order to retrieve a clean editable cart.
After that the word "Entry" could be change thanks to the language override or by view editing.
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.