Hello GIJOE,
Firts , many thanks for this great module,very clear and very easy to use ..really good work.
I don't find any forums on your site so i write here some idea i have about this module.
When you display 'system' page , it will be great to sort all modules with 2 keys.
Primary key will be the side key. For example , idea is to display list of block with primary key side ( from left to right) and lock with no disply side at end . And with secondary key , the weight ascending key .
It you can do this , i think the reading of block list will be more easy.
It can be give a list like that :
Block X Side : Left Weight : 10
Block C side : Left Weight : 12
Block Y Side : Center weight = 20
Block B Side : Center weight = 25
Block z Side = right weight = 100
Block A Side = right weight = 200
Block P NO SIDE weight 0
Block Q NO SIDE weight 20
and so one

Sorry for my english . I hope i have write no too bad and you will understand what i mean .
Sure you also can enhance this by putting one sort button on each title of each column and when user will click on each button it will sort block list by this column order .
I know , i ask many and may be it is also many work for you ;) It is just some ideas i have to enhance your still very good module .
Friendly .. Denis