Hi,
I might have an idea for that.
In HikaMarket 1.5.0 ; I remove the usage of the HikaShop user class for the user registration.
So now the user registration is made by the HikaMarket user class (it allows me to have more control on the data and have different reaction for the redirection or activation part... but that's not the current subject here).
In the class, I set the user group regarding the Joomla configuration (for new created users).
It result that
if(HIKASHOP_J16)
$data['groups'] = array( $newUsertype => $newUsertype );
But it is possible at this moment to introduce a new user group in the list or just to override the default user group from the Joomla configuration.
At this moment, users created by HikaShop in the user registration won't have the same group than users created by HikaMarket (in the vendor registration).
Would it be something good for you ?
Regards,