WordPress Plugin Development (Simple Tweaks)

Hi There, There is a WordPress plugin I wish to use on my website called "showtime" ([login to view URL]) This plugin is used for displaying an online radio timetable. Anyway there are a couple of things I need doing: 1) The plugin hasn't been updated for a very long time, so I need it to work with the current version of WordPress 2) I want to add a description field when adding a show 3) I need an Image to display on the main list of shows (At the moment its just showing the time and title) 4) Identify any other bugs with the software The goal is to use this plugin going forward without any problems, but at the moment there are loads of little bugs with it. The plugin is very simple and straight forward, so I need someone who is familiar with Plugins to be able to look at this. Regards Tom