I believe layer breaks are required to be at a chapter point to be within DVD-Video spec. Most pro apps require this else they render with errors. Also, Layer 0 must be larger in size than Layer 1. You will just have to create a chapter point at some point between a song. These are the two biggest things that tripped me up when doing my first dual-layer authoring.
There are also options for OTP (opposite track path) or PTP (parallel track path.) For the shortest layer break time, choose OTP. On OTP, the laser reads from the inner part of the disc to the outer part, then at the layer break, it jumps from Layer 0 to Layer 1 at the outer part of the disc and starts reading back inward.