Default [Q&A] status bar icon "DC" --> Dual Carrier on TW

Hi all,
is possible modify the RIL of the TW Rom to support "DC" icon on status bar, like CM?
The TW Rom use generically "H+" status bar icon for HSPA+ and DC-HSPA+... only on samsung service mode there is the "DC_HSPA" set on 1...
What files must be modified? Is possibile to add this feature?

Tnx