So I feel the Breacher needs some extra love, currently it doesn't have many pros over the standard Riflemen and Advisor classes. Besides buffing the SMG's, which is heavily needed IMO (check my other topic here), I had another idea to make the Breacher potentially more effective and interesting in CQC.
A breaching charge, like a C4, however with the difference that the blast only goes one way (with penetrating power). So you can put it on doors or walls and kill/wound everything behind it within a reasonable proximity, while staying safe on your side.