WiX Setup project referencing two Wixlib having same File/@Id

Question

I am new to WiX, but need a complicated scenario! I manage a modular web application containing multiple WCF Library (i.e. module), and need to put every module as a feature in the final setup.

So I managed a WiX Setup Library for every module which genrates .wixlib files, and a single WiX Setup who references the .wixlib projects, and also will be a one-to-one relation between modules (i.e. .wixlib) and features in the final setup.

The problem arises when there is same files shared among .wixlibs, due to similar File/@Id and Componend/@Id which will be there for those shared files.

P.S: I have used WaX as engine to build .wxs files, which simply uses file name as File/@Id and Component/@Id in the .wxs files.

I beleive there could be two possible workarounds (I could achevei non of them!)

1. Some way to force WaX generate randome File/@Id and Component/@Id for every file.
2. The could be a way in Lit.exe (who builds .wixlib) to append a random id to File/@Id and Component/@Id while compiling and generating final .wixlib files.

Any sort of help will be appreciated.