When I have a kernel module without symbols, I'd typically first open it in IDA and give names to some of the subroutines (those I'm interested in).
Since I prefer my kernel debugging with plain WinDbg (and not the IDA-integrated WinDbg), I'd like WinDbg to recognize the names IDA (and me) gave to those addresses. That way, a) I could break on those functions by name, change variables by name, and b) WinDbg's output and views would read better (in stack traces etc.).
Unfortunately, IDA has no "create PDB" feature, and I don't even see a non-PDB way of importing addresses into WinDbg.