To MQ Changing lots of pendings ?

 
Hello.
I have this little problem :
I would like to change the lots size of pending orders, is there a way to do that ?
I write an EA wich place pendings, but following the market, the "weight" of those pendings must be changed.
I know I can delete some of them and/or create new ones, but they are all on the same price, and when that price must be updated according to the market, for sample every 5 min, all orders must be modifyed to the same price.
For sample, if the "Weight-Step" is 0.1 lot and the "Weight-Range" is 0 to 10 lots, when I must update the price, I must send up to 100 indentical OrderModify(). This seems a great and unnecessary lost of time for the Client and the Server.

To agregate orders myself is ok, but here too there is a lot of delete-create calls without real necessity...

Why is'nt allowed to modify the volume at the same StopLevel's conditions as the price ?
Thanks for your time to read and answer me.
Michel