WHBM,
The overwhelming majority of the time we will not create artificial gaps to allow for the crossing of the the southern runway.
When it is the departure runway, we cross in the wake turbulence separation gaps, or the similar routeing separation gaps.
When it is the landing runway, and we cannot cross in the non-wake pair gaps, we will generally wait until a wake turbulence separation gap arrives.
However, if a 'natural' gap is not going to arrive for a while, then we might create one.