This plugin create one new capability called "manage_polls", which is used to grant all permission to whole plugin's menus.
Inherent support for splitting permissions should be taken care of by plugin's author, in order to supply the flexibility to let admin decide who can do what, and this would be by creating more capablitites option.
Anyway, lacking this inherently in the plugin, we could still add an action to hook the WP building menus and submenus items, and alter them to the needs.
Add this code to your template's functions.php file, and it will remove for non admin users the 3 polls submenus that not needed:
function tc_remove_poll_menus () {
global $current_user;
if (!current_user_can('administrator')) :
global $menu;
global $submenu;
//remove poll sub menus
unset($submenu['wp-polls/polls-manager.php'][2]); //poll options
unset($submenu['wp-polls/polls-manager.php'][3]); //poll template
unset($submenu['wp-polls/polls-manager.php'][4]); //uninsall plugin
endif;
}
add_action('admin_menu', 'tc_remove_poll_menus');