WordPress.org

The mouseover method is the default. How do I use the parentheses?

As there is no options page (yet), you will need to edit the /wp-content/plugins/unit-converter.php file around line 31 and change:

$display_mode = 'mouseover';

to

$display_mode = 'parentheses';

Does it really require WordPress 2.7?

I'm not sure because I haven't tested it on anything earlier. If you use an earlier version and it works, let me know!

Why does it require PHP 5 when WordPress supports PHP 4?

It's time to move forward. See GoPHP5.org for more.