Yes, I do run HumongousSoundtracks. Unfortunately it's been nine months since I did anything on there. The Fat Man actually has the Putt-Putt Saves the Zoo soundtrack on Vibedeck for free, if you want to check it out (it's beautiful sounding too, as if you were listening to the original masters in full stereo!). We're still waiting for his others, but that one's there in the meantime. I'll be sure to show some support for them when I get the chance.
About being unable to save through ScummVM's save system...apparently they disabled that on games that use a different save system other than through the typical SCUMM method (the Monkey Island and Maniac Mansion games save through the SCUMM system, for example). I find it to be a really dumb move, but if it's what they want, it's what they want.
Wait, you torrented it? Uhhh...if the dev team for SVM were here right now they'd kill us
For LEGO games, here's what my experience is with compatibility...
LEGO Island: This one was wonky when it came out, and it still is. My best advice is just kill off Direct3D HAL altogether -- it's a terrible mode that should have never made it past the QA testing. On XP it's usually fine, on Vista and 7 (I'll call them Aero, because contrary to popular belief, they're actually near identical in terms of compatibility. Anyone who says Vista wasn't needs to actually use it before they jump to conclusions) it's annoying. On 8, the frame rate can be a bit low (I don't know what it is with old games on Windows 8, but for some reason they never seem to run at the right frame rate).
LEGO Island 2: Already covered above.
LEGO Island Xtreme Stunts: Again, covered above.
LEGO Racers: I have yet to find a computer that can't run this game flawlessly, though it's not very good with higher resolutions; I usually just play it in its default resolution.
LEGO Racers 2: Same as above, in fact the only thing I really think needs to be done is get rid of the RAM check altogether (not just fix it, kill it entirely). You see, this game has a bug that prevents it from being installed on machines with more than 2 GB of RAM, because it checks it with a signed 32-bit integer that overflows there.
LEGO Alpha Team: On XP, it has that dreaded looping glitch, where the voices and music get stuck in an infinite loop and prevent progress without being turned off. Aero plays it fine, Windows 8 has a bug where you get a window border around it unless you use a QRes fix, but it otherwise works fine.
LEGO Stunt Rally: I've heard reports about it crashing on some screens, and I hear some versions won't even run without a printer (I've been able to do it though, which makes no sense), and it's also one that doesn't cooperate well with Windows 8. I haven't had any issues other than the W8 issue, but I dunno.
LEGOLAND: Works fine, except for its dreaded 16-bit installer, but thankfully that can be worked around. It also has to be run as an administrator if you're on Aero or above (Screw the start screen, the UAC is the stupidest thing Microsoft has ever invented!).
LEGO Rock Raiders: On Windows 8 it runs at a super low frame rate unless you're windowed. No clue what that's about. Most other OSes run it fine though, but the music will often not play. At first I thought it was because it was one of those that called cdplayer.exe to play the music which was scrapped out of 9x versions, but it plays on my current computer so I don't know.
LEGO Chess: I've heard of all kinds of problems with this one. It uses a 16-bit installer from what I hear, but that's only the beginning. Some others might be able to inform you more about this.
Creator: Haven't tried this one on any other computers besides XP, so I don't know if it runs on Aero or 8.
Drome Racers: Have no clue, but the fact that nobody's ever asked anything in the support forum about this makes it look promising.
Soccer Mania: The game runs, but I hear it has a messed up save system. Others can probably tell you more about this.
LOCO: The biggest issue is that if your resolution width is not between 800 and 1280 and the height is not between 600 and 1024, the game will not run. Your resolution can be anywhere between there (even if it's completely illogical and irregular, like 1142 x 689), but if it is not, the game won't run. I imagine this could probably be fixed by making it automatically switch to a resolution though.
So, that's my knowledge on most of it.