Multiple SMSCs and a DLR group

I just got several SMPP connections to a carrier today and set them  
up. I gave each one its own name in the smsc-id field. But the same  
name in the allowed-smsc-id field.

My thinking behind this was so that I could control each smsc  
individually via the admin interface, but still get it to load  
balance by using the allowed-smsc-id. The problem I found in doing  
this was that I sent a message via one smsc, and the DLR came back  
via the other. Now since they have different names it meant that the  
DLR was not found in the database.

For the moment I have simply named all the SMSCs the same, which  
clearly rectifies the DLR problem, but means I don't have individual  
control over the smscs.

I think a simple fix would be to have another field say dlr-id, which  
if not set would default to the smsc-id. This field would then be  
used for the smsc name in the dlr tables. This way you can group  
multiple smscs into a logical dlr group, but still have individual  
control over them.

Any thoughts on this before I have a go at implementing it?

Regards

Ben