In case of the multiple lane system, I chose not to divide the primary spline because having more points would mean having to make sure that all of them are aligned correctly. For example, a segment of the spline which could be represented by just two points would end up getting split up into multiple points. Any change made to one of these points, would require the user to update the nearby spline points as well to maintain the course. But I’ll verify if there is a way to implement this feature within the construction script, & let you know about it.
As for the lane gap distance issue that you’ve been facing, the inner lane (at the turn) will deform at high gap distances if there is not enough space to curve around. But I wasn’t able to reproduce the issue on the outer lanes at my end. So could you provide the steps to reproduce this on a new project?