I'll see if we can add something to not allow them to use the Squirrelcart theme. If I don't end up getting it done in time, you could always add some custom PHP to the account_options_nav.tpl.php template. Change this:
PHP Code:
<?php if ($Show_Theme_Field): ?>
<div class="valign_middle theme_choice">
Theme:
<select name="theme_user" onchange="this.form.submit()">
<?php foreach($Theme_Option_Groups as $Theme_Name => $Theme_Options): ?>
<optgroup label="<?php print $Theme_Name ?>">
<?php foreach($Theme_Options as $Theme_Option): ?>
<option value="<?php print $Theme_Option['value'] ?>" <?php print $Theme_Option['selected'] ?>><?php print $Theme_Option['choice'] ?></option>
<?php endforeach; ?>
</optgroup>
<?php endforeach; ?>
</select>
</div>
<?php endif; ?>
To this:
PHP Code:
<?php if ($Show_Theme_Field): ?>
<div class="valign_middle theme_choice">
Theme:
<select name="theme_user" onchange="this.form.submit()">
<?php foreach($Theme_Option_Groups as $Theme_Name => $Theme_Options): ?>
<?php if ($Theme_Name != 'squirrelcart'): ?>
<optgroup label="<?php print $Theme_Name ?>">
<?php foreach($Theme_Options as $Theme_Option): ?>
<option value="<?php print $Theme_Option['value'] ?>" <?php print $Theme_Option['selected'] ?>><?php print $Theme_Option['choice'] ?></option>
<?php endforeach; ?>
</optgroup>
<?php endif; ?>
<?php endforeach; ?>
</select>
</div>
<?php endif; ?>