Oops forgot to reply the legato part of your question,
@Casiquire. Basically, I think that Low Latency legato will handle most of your needs, most of the time. I spent ages on this mode - its aim is to be as playable and realistic as possible, with minimal editing. I personally use it almost exclusively now, but I also left the original "Advanced" mode from the original version more or less 100% intact - there are still times when this mode sounds more appropriate / better for certain passages - especially slower material. Advanced has been renamed to "Expressive".
So in summary, Standard / Advanced has been replaced by Low Latency / Expressive.
Yes, the timing between CSS's new Low Latency mode and CSSS's Standard mode is a bit different, therefore you may need to slightly adjust your workflow to achieve the "1st chair layering" technique. However, Expressive mode lines up perfectly with Advanced mode, so you could still use those two together without issue. You could also potentially use the "Classic legato" patches in CSSS if you want them to line up (timing wise) with CSS's Low Latency mode, as it's close enough to not be noticeable.
I'm hard at work on the CSSS update to implement Low Latency legato mode etc (you can hear the new solo violin 1 in the mid section of the Together Again demo. When that's ready it will line back up again perfectly with CSS, but for now the above workaround should be fine.