Takeshi, all you mentioned is already possible

At the very least, all you need is
a) For the fansub tracker site to have a torrent RSS feed (
example from Nyaatorrent's search-feed).
b) Scheduling software, which I believe Windows already has its own version of. It's easy enough to create a schedule for it to switch on for 4 hours every night and then go into standby again, just before you leave for vacation. I use it to switch on my laptop at night to do its own backups.
uTorrent's RSS downloader as well as its load-from-folder feature already provide for lots of automation opportunity. These 2 features are available in many other torrent clients as well, so all it takes is to try it out yourself or google it up.
Not that making everything automated is really such a good idea anyway; there simply isn't enough standardisation in the fansub community to create a really reliable fully automated system (I don't think we really need it anyway). For instance, Eclipse doesn't have a torrent feed, so you'll have to rely on a web service like
Page2RSS to monitor their releases (I use it on their XDCC page). I prefer to use as few tools as possible in setting up automation so I avoid using it, but sometimes you just don't have much of a choice.
I don't download so much that I need a fully automated system to manage my downloading. Most of my downloading is via XDCC anyway, so I just have a few RSS feeds for releases I'm watching, then search for newly released stuff on
#news, paste the command in irssi (running on my NAS which I'm ssh'd into). When I get home I'll have new episodes waiting in my unwatched folder.