Subburb...Fernando and I will be at SIGGRAPH, so look forward to meeting you. We'll be at the ChaosGroup booth which is booth num 3119 I believe.
I really like the solid rocks plugin, so it would certainly be a welcome addition to VfSU. Unlike the ChaosGroup, which hasn't really expressed much of an interest in changing their interface, that's probably the biggest request we get. Subsequently the next full version of VfSU/Rhino will have a tiered interface solution with a Basic UI, Intermediate UI, and an Expert UI (Expert being essentially exactly what we have now). The Basic and Intermediate UI will remove a lot of unnecessary parameters and offer some more user friendly ways to adjust settings than having to deal with numbers.
There will be some more resources available in the next full version to do something like Solid Rocks, specifically the ability to add custom UI. I'm not sure how much we'll be offering in terms of scripting support, but hopefully there will be something to offer as we currently don't have anything exposed scripting wise.
In regards to the changing the settings for high res, there isn't the need to double the LC subdivisions. The reason being is that LC is not really tied to resolution in the sense that each sample area will be the same percentage of the final image (assuming screen sample scale) and although that area will cover more pixels, it will not change in regards to the area of the scene that each sample is describing. Therefore, regardless of resolution, there will still be the same number of samples created, and each of those samples will get approximately the same number of subdivisions. When you begin to change the sample size to add more actual samples, then the LC result with the same number of subdivisions will be more noisy and require more subdivisions. I'm actually an advocate of using smaller sample sizes (I typically have mine at about 0.5%) since that allows the LC solution to capture more detail and make better use of adding additional subdivisions.