Not to make light of what is a serious problem, I am afraid not even Sony seems to know the answer to that. As you probably realise, they don't seem to be offering any ongoing support to MicroMV users of their own branded product! Expecting other companies to then try to rectify a problem which even Sony seems unwilling to do, is probably asking too much.
I am afraid that this was a common problem with previous versions of Video Studio, and I don't think anyone ever found a solution. If changing the capture plug-in to the MicroMV one doesn't work in VS10, there doesn't seem to be any alternative but to using the klutzy capture software that your camera should have come with, and then transferring it to VS. The main problem with that, if I recall correctly, is that the capture format is yet another Sony one, and is not quite as large as a full DVD frame format.
Ken is certainly right that Sony have given up on those of us who bought the MicroMV cameras! It seems to be the Beta story all over again. It'll be a while before I buy Blu-Ray deliberately.
There are some solutions. Movieshaker 3.1 captures OK and I have been able to edit with it. However, I too was looking to get something better.
If you use MovieShaker to do the capturing, there is a neat little utility called mmv2mpg which converts the transport stream mmv to a standard mpg format which other programs accept just fine. There is no decoding and recoding it is just a format changer.
I have also found that MediaStudio 8 trial has a good capture program that detects my MicroMV as an HDV and captures from it nicely. However, it is a bit pricey, but it does mean that ULead can capture from these cameras. My note earlier indicated that VS10 is almost there.
As Sony has abandoned us, I do not complain that ULead hasn't leapt to our support, but I do blame them for still showing these cameras as supported in their compatability list, when clearly from this forum, they are not.