Security Permission to restrict importing at the entity level

Hi,

I have restricted importing on the Core records tab, so removed this right against Data Import, Import source file and Data Map,  however there is a custom entity which users need to have full access to, they currently have all rights apart from the right to delete. The 'Import Data' option is still visible on screen at the entity level, is there any way I can remove this?

Basically I need the users to have no import rights at all.

Spaz