checkout payment: replace images with text

and hi again

i would like to show the name of the payment method as text instead of an icon. or even better, show both. in the template-functions.php at line 644 i've found this:

if ($plugin->method_img_url) {
          $content .= '<img src="' . $plugin->method_img_url . '" alt="' . $plugin->public_name . '" />';
        } else {
          $content .= $plugin->public_name;
        }

but there seems to not be any visual setting for this in the admin. does that mean i have to hack it directly into the template-functions file?

thanks for your help!