Regarding DST, I assume you restarted the TViX after you changed it to get the time over the network, right? I noticed that changing DST to "on" had no effect on mine immediately, but after turning the unit off, it had the correct time the next day when I turned it on again. I'm guessing the TViX checks the time server at boot time. Since your post didn't explicitly mention it, I'll also note that you do have to change the DST option by hand; the TViX cannot adjust for DST automatically when you're using PSIP or network time.
Regarding firmware, DVICo never made any promises about updating the firmware, so we can't have any expectations regarding something they never said they would do. The 2.1.0 firmware is far more stable and has far more features than the original one, so the TViX has already come very far since its initial release. Seeing as the Xroid is going to supercede the TViX once a model comes out with DTV tuners, it wouldn't be surprising if the TViX didn't get any more firmware updates.
There have been no official announcements regarding the support status of the unit from DVICo, so we don't know what's going to happen. What we have to ask is, "What would a new firmware accomplish?" There isn't much to be done at this point, except to do things that DVICo has already stated won't happen, like adding CC support. Fixing the ION bug would be nice, but nobody's been able to make logs that would help them solve the problem, to my knowledge.
Regarding SMB, you're ahead of me. I tried typing the \\\\x.x.x.x IP address of my TViX into the Windows Explorer URL bar, and I got an error. I'm guessing the TViX can't do SMB without NetBIOS support, and since I have it disabled on my computer for security reasons, I probably won't be able to get files from the TViX without using FTP or USB. Oh well. If there's another way to see the TViX HDD contents over the network, I'd be interested to know what it is. From the documentation, it seems that the TViX doesn't have a NFS or UPnP server to go with its SMB one.
Anyway, it's already been established that the TViX only supports 1 FTP connection, so it likely has the same limitation for SMB. Earlier speculation in this topic surmised it might be due to hardware limitations, although it could be due to a sub-optimal design decision, too.