By convention, the kspace part of the code always includes all interactions, even self-interactions and it is not possible to exclude these in that part of the code. However, a correction to the nearest image can be made in the short-range part of the code, so in theory all intramolecular pair-wise interactions could be excluded. But LAMMPS may not yet be setup to handle “neighbor_modify exclude molecule all” with kspace–I’d have to look at the code to see what is going on.
Stan