Amjoie - it is a lot of links as this has been a growing problem since at least LN, but most of those conversations went on over in the CAW forums. Most of the long time world creators are aware of this issue - but check Magic Dancers thread when she remade Sunset Valley and added streets, flattened area _ it's called Sunset Valley 2 I believe - but she first released it with no lots at all and people came out of the wood work asking her to place the lots. I have found out that adding more than 4 or 5 small lots seems to break routing - which gives you the bad playability of any world with broken routing - constant hiccups that grows excessively worse. But i believe the earliest discovery of this problem was when I was with a group of simmer in the CAW forums we called ourselves the "Sims of Caw Lane" and were totally comprosed of World/lot creators, and testers - that worked together helping other simmers test their worlds so as a group we could cover a world in no time and find all the kinks, then we would check over each others lists of problems to verify and find the problems - but along the way we started noticing the trouble with using the ingame editor - that placing more than one or two big lots would break the world - and placeing over 3-4 medium lots, and 4-6 small lots, seem to break it. We only later found out what was happening was placing the lots was breaking the final routing done on all worlds when they are ready for others to use. The only way to fix of course was to put the world back in CAW and it is not always a easy thing to do - especially EA world. But it seems with each ep we are able to place less and less lots before the breakage occurs. But anyway in Magic Dancers thread the people talked her into adding a ton of lots in CAW so we did not encounter the Hades of the fickle world editor. (ETA: I am one of the first who found this problem - it's just been reaffirmed constantly through others since. I also was one of the ones that found the work around for the fishing/seed/ and shopping problems with WA - so I find and try to fix or find fixes to most problems - but there is no fix for this if you don't use CAW).
Also regarding rest of your post - you can't really use Awesomemod with the same mod Twallan has that do the same thing from my understanding - so you are wise to just choose one. But in the case of Twallans mod you can safely delete those sims from what everyone tells me and then remove the mod if you don't want to use it - unlike awesomemod. Both Pes and Twallan are brillant modders - so it is really the choice and game play styles of the user. I just prefer to play modless anything that rewrites game code so I give things I am testing a fair test - so i have learned to play around the disadvantages of using totally EA gameplay. I am so used to it, it is second nature to me. But both of the SP from those two modders are fabulous - so I stand behind your decision to choose what ever works best for you seeing you do know all the ins and outs with using the mods. I only get annoyed with folks who don't bother learning what they are using and then jump all over EA. Some things people blame on the game is not very likely (I want to say impossible here, but know nothing is impossible) it was normal game play doing what ever. But I don't need to add all that hoopla in here. In my mind you are indeed a very responsible mod user and do know what you are doing - even if your have no idea which direction to go at present - I do think you have a plan anyway and know where you want to end up. i can see it working eventually with that much determination.
About the Mausoleum - you do know you do not have to have it in a graveyard. If you would like it just out of sight but there for the job use and any other uses it has - you can always put it on a small remote lot somewhere - It is a rabbithole, so it should even be safe to add to any lot with other RH buildings.
I also do not think the ghost hunter career is tied in with the Cemetary as the ghosts in that career are not the same as the ghosts in the cemetary. The game does not recognize the ghosts of one having to do with the ghost of the other. The career ghost I believe are object ghosts and not lifestates. I looked for the post I saw that, but cannot seem to find it - but it sounded correct for sure.
