Welcome Guest! Would you like to log yourself in?

[zcnb]

I am not sure that I would like a first time visitor in my store to see the default:

Welcome Guest! Would you like to log yourself in?

I would like to replace it with something else: if this is a logged in return customer, then use the default:

Hello first1! Would you like to see our newest additions?

But if this is a visitor (or a return customer who is not logged in for some reason), then see something a little more descriptive than just "Welcome Guest". Something that will describe what this store is about.

I know that this message is in the file includes/languages/english/index.php:

define('TEXT_MAIN','This is the main define statement for the page for english when no\
 template defined file exists. It is located in: <strong>/includes/languages/english/i\
ndex.php</strong>');

// Showcase vs Store
if (STORE_STATUS == '0') {
  define('TEXT_GREETING_GUEST', 'Welcome <span class="greetUser">Guest!</span> Would y\
ou like to <a href="%s">log yourself in</a>?');
} else {
  define('TEXT_GREETING_GUEST', 'Welcome, please enjoy our online showcase.');
}

define('TEXT_GREETING_PERSONAL', 'Hello <span class="greetUser">%s</span>! Would you l\
ike to see our <a href="%s">newest additions</a>?');

define('TEXT_INFORMATION', 'Define your main Index page copy here.'); 

My question is: Is there a more correct way ("Zen Cart wise") to change that "Welcome Guest" text with more elaborate one? Or do I have to touch that PHP file (I don't really like mixing customizable text with code).

Thanks,
Daniel