Great to see that you have now provided a decent upgrade to include the ability to render sections. I was at the Sketchup Basecamp Europe recently and the absence of Shaderlight was met with rumours that development of Shaderlight had halted. Upgrades for the last couple of years have been just to keep pace with Sketchup rather than upgrades to Shaderlight itself. I am a great fan of Shaderlight but was starting to waver, even though it would mean throwing away my investment in Shaderlight, as it seemed to be being left behind by the likes of Thea Render. I have trialled Thea but have found it difficult to use compared with Shaderlight. However as well as sections, it still has a few of features which you should consider incorporating into Shaderlight.
1. This should be simple - proper queuing of rendering frames rather than using the animation scenes workaround which is far from satisfactory
2. The ability to change the depth of field to have some areas out of focus. Even free Visualiser can do this.
3. The ability to render animations across a network by the use of Shaderlight render nodes which could be installed on many computers.
4. Beyond Thea, an option to render Shaderlight with Sketchup lines too. This is a good way of getting good looking renders without having to employ proper materials etc in the early stages. I presently use a Photoshop work around by producing and Shaderlight render and a white Sketchup model and combining them in Photoshop. The transparency of the lines can be adjusted this way. A direct option would save time and improve quality.
The ability to render cut plans and sections is essential in this world of BIM. It would be also good if you could work with Skalp in rendered mode as again this is useful in the BIM world. The preceive stagnation of Shadlerlight seems to have Sketchup users and developers (such as Skalp and Skatter) drifting over to be compatible with Thea when at its core Shaderlight is a better product.