Ok, after quite some time being really annoyed at not being able to commit when I want to the cvs at sourceforge, and sync operations taking almost forever sometimes (yeap, I double-check everything before commiting), I've decided to take a look at alternative options.
Basically, descentralized scm systems seem the way to go, so, after taking a (rather quick) look at some of the alternatives (which were: mercurial, git and bzr), mercurial apparently seems what'll go better with how I want to work.
It seems to be able to coexist nicely with the base in place -- that's a must because I'll have to keep commiting things to the cvs at sourceforge. And it's pretty non-obtrusive (it doesn't keep zilions of files around each folder as svn and cvs do. All is kept under a single folder, out of the way of the actual projects -- and having a single .hgignore file instead of one for each folder is also pretty nice)
All my projects are in a X: drive (when in windows), so, basically, I've simply created a mercurial repository at X: and imported all the pydev stuff into it.
I've just played with it for about 1-2 hours, and I already feel I cannot live without it anymore ;-)
I'll probably change my modus-operandi to make all things in my machine, with patches and diffs (BTW: I'm using KDiff3 which integrates nicely with Mercurial for that) and just commiting everything to sourceforge at once, without having to double check all those things...
But the most important thing is: I feel really relieved of not having to make those syncs that took forever to see if everything is correct when commiting to sourceforge (and working offline is a big win too).
The major drawback is that the integration with Eclipse is still in its early stages (in fact, I'll probably be using the command line and diffs with KDiff3 until it matures -- which I hope will not take long) -- but that's still a minor thing when compared with the advantages.