Lucky will not need this, but it might make things easier for him and the rest of us.
I just added a script that will make the button open a window prompting for the rows and columns of the table, then inserting the table into the post with a row and column number in each for reference. Before, you had to edit the BB code and hope you got everything lined up right. This code gives you an Edit button, so after entering the Rows and Columns you can edit the table's contents before inserting it into your post. Here is an example: