Based on my testing I think if you go to the preferences > Produce Tab and tick "Allow SVRT on single IDR H.264 Video" will allow SVRT to be used through split clips for my Canon 1920x1080, 24Mbps clips. It also appears to allow SVRT to be used after transitions applied between clips.
Not totally sure of the potential downfalls or if it truly allows SVRT to work in all situations. I've test transitions (various durations), color blocks, titles, pics in the middle of a split clip and it has not failed yet. I also tested the same list above between two non split clips.
All scenarios listed were tested via writing to BR. Resulting video bitrates fluctuated some when transitions, and such were used.
Jeff