Alien abduction was hard as heck for me to trigger. Took me weeks to get it for one specific sim, then all my other abductions were random after that. Cue my disappointment that it is the same impregnator.
Personally im a firm believer in keeping it as it is. Its a pack about vampires, not just vampires on the side. I haven't even seen vampires walking down the regular lots and I had to go initiate finding them. Vampires appear at your house once YOU build up the vampire lore skill and seek them out.
Haven't seen any spawners, but I dont doubt it. But tbh i don't even see vampires biting anyone. Occasional power use but that's it.
I'm neutral on toggles but I don't want it to cut on the quality of content i paid for. Also its just a bit silly imo. Its a vampire pack... I know not everyone wants them in each files but you can probably get mods for that or just ignore them. Its not like sims 3.