Cafu Engine

Is there any way that I can use "step" command of gdb to debug DeathMatch? For example , in VisualStudio, I can add a breakpoint to a line(the code may be an invoke of a function), when the program comes to this line, it pauses and I can use Step-Into to go into the function to see how the it actually works.
I think Step-Into is not only a very efficient way to find bugs but also a good way to explore code. Can I do this with Cafu in Linux ?
I've tried typing But once the Cafu starts(GUI menu appears), I can't input any gdb command. How to put some breakpoints into the code of DeathMatch? (For example, What should I do if I want the game pauses once I open fire with the left mouse button?)
Thanks!

Well, never mind. I just figure out how to debug with gdb in Geany, and I can use Step-Into sucessfully. Geany is really a great light IDE and you can use set scons within it to build.
Keep on exploring