[Plugin: Availability Calendar] Availabilty Menu Presence

Hi there,
First off thank you so much for creating this plugin it’s absolutely perfect for what I need, it’s simple and does the job brilliantly.
That said I have one small problem that I have encountered that I can’t seem to find the solution to anywhere.

When I log in as an editor I can’t edit the dates or even see the ‘availability’ menu on the left (only visible as admin). This is really important for me as i want to allow clients who can sign in as editors to edit their own dates but without having admin status.

I don’t know much about coding (am learning) but I’m guessing the bit that needs to be changed is this part in availability/index:

if (is_admin()) {add_action(‘admin_menu’, array(&$this, ‘admin_menu’));
register_activation_hook(__FILE__, array(&$this, ‘activate’));
} else {

but I cant figure out how to sort this out, please if anyone can help, i would be so so grateful.
Thanks, Ben