Features like Import, Export are termed as module tools. Such tools can enabled or disabled as
shown below:
The example given below describes the way to enable and disable the tools for InstalledBase module
include_once('vtlib/Vtecrm/Module.php');
$moduleInstance = Vtecrm_Module::getInstance('InstalledBase');
$moduleInstance->enableTools(Array('Import', 'Export'));
$moduleInstance->disableTools('Export');