Question 2: I changed some things in my lots Downtown. Since the default Downtown is the same in every Neighborhood, I don't want to go through the hassle of having to load up the same lots in another Neighborhood's Downtown, just to make the same exact changes. I wanted to copy the files from Neighborhood 1 into Neighborhood 2. I think this would work (would welcome any suggestions as to why it wouldn't so I can give up if it'll screw up my game), but because the file names (lot numbers) are different between my neighborhoods, I'm not sure which lots are the same. How can I determine which file names correspond to which lots? Again, either in game or in SimPE?
I have some experience with this since I was missing a bunch of lots from some of my downtowns and had to transfer them from the one intact downtown I did have (although one downtown has invalid entries for N3rD Pad and Liliflower--???). Just package the lots you want to duplicate and install them by double-clicking the packaged-lot file. This will make them available as lots that may be placed in neighborhood view. Go to the downtown where you want to place the customized lot, bulldoze the old lot, and place the customized one.
In the original game, you needed to move packaged lots out of the Packaged Lots folder (and perhaps even out of the My Documents\EA Games\The Sims 2 folder altogether) or you would only be able to place them once, but I've read somewhere that this is no longer necessary. I move my packaged lots to an archive folder anyway, just to be safe.
This is more cleanly done if you have the Clean Installer, since you can then specify to install just the lot file. With the Maxis default package installer, any custom content, hacks, etc. that get scooped up with the lot will be reinstalled with
_0001 appended to the file name (instead of simply overwriting the existing file--doh!), resulting in duplicate files. For example, if you've used the wall from file
wall_2ee2f041.package in your customized lot, it will be reinstalled by the Maxis package installer, and you will now have this file and also
wall_2ee2f041_0001.package. With the Clean Installer, you can choose to install just the
lotSegmentForUpload and leave out all the recolors, sims, clothing, makeup, hair, skin tones, and all the other stuff that gets packaged with your lot--you have all that stuff in your game already.