Yes, LiveRoof modules can be cut to size and shape with the use of a masonry saw or reciprocating saw. When custom cutting LiveRoof modules, the cut side should abut the non-cut side of another module, in order to contain the soil and minimize the work of installation.
If the cut side ever abuts edging, it should not be edging that is located on the low, draining side of the roof.  Always fit modules tightly against edging or parapet or surround with drainage fabric for added security.