http://ez.no/doc/ez_publish/technical_manual/3_10/reference/configuration_files/content_ini/removesettings/showremovetotrashcheck
says, that you can hide the "Move to Trash" checkbox by setting
ShowRemoveToTrashCheck to "false"
This does not work with ez 3.10 and an ezwebin interface.
I tried to set the setting to "false" using the admin GUI and tried with "siteaccess" overwrite.