I decided to check out IC Expanded tonight. I installed the resources only from the IC Expanded Web site, and then the replacer ICExpand.esp from the Better Cities archive.
FYI, it appears that the replacer plugin isn't clean, as there are some references that should be undeleted and disabled:
Undeleting: [REFR:0004A357] (places ICTombstone05 [STAT:00036018] in GRUP Cell Temporary Children of ICPalaceMQ1601 [CELL:0004A2AE] (in ICImperialPalaceMQ16 "Imperial City, Green Emperor Way" [WRLD:0004A250] at 6,14))Undeleting: [REFR:0004A301] (places ICTombstone06 [STAT:00036019] in GRUP Cell Temporary Children of ICPalaceMQ1601 [CELL:0004A2AE] (in ICImperialPalaceMQ16 "Imperial City, Green Emperor Way" [WRLD:0004A250] at 6,14))Undeleting: [REFR:0004A2EE] (places ICTombstone03 [STAT:00036009] in GRUP Cell Temporary Children of ICPalaceMQ1601 [CELL:0004A2AE] (in ICImperialPalaceMQ16 "Imperial City, Green Emperor Way" [WRLD:0004A250] at 6,14))Undeleting: [REFR:0004A42A] (places RockGreatForest165 [STAT:000250ED] in GRUP Cell Temporary Children of [CELL:0004A2AD] (in ICImperialPalaceMQ16 "Imperial City, Green Emperor Way" [WRLD:0004A250] at 6,15))Undeleting: [REFR:0004A429] (places RockGreatForest050 [STAT:000250C5] in GRUP Cell Temporary Children of [CELL:0004A2AD] (in ICImperialPalaceMQ16 "Imperial City, Green Emperor Way" [WRLD:0004A250] at 6,15))Undeleting: [REFR:0004A426] (places RockGreatForest050 [STAT:000250C5] in GRUP Cell Temporary Children of [CELL:0004A2AD] (in ICImperialPalaceMQ16 "Imperial City, Green Emperor Way" [WRLD:0004A250] at 6,15))Undeleting: [REFR:00037E5B] (places ICTombstone03 [STAT:00036009] in GRUP Cell Temporary Children of ICPalace05 [CELL:0001C29F] (in ICImperialPalace "Imperial City, Green Emperor Way" [WRLD:0002C10F] at 6,14))Undeleting: [REFR:00037DB8] (places ICTombstone06 [STAT:00036019] in GRUP Cell Temporary Children of ICPalace05 [CELL:0001C29F] (in ICImperialPalace "Imperial City, Green Emperor Way" [WRLD:0002C10F] at 6,14))Undeleting: [REFR:0003602E] (places ICTombstone05 [STAT:00036018] in GRUP Cell Temporary Children of ICPalace05 [CELL:0001C29F] (in ICImperialPalace "Imperial City, Green Emperor Way" [WRLD:0002C10F] at 6,14))
It's certainly easy enough to clean, but just mentioning it in case you want to clean it prior to your next release.
EDIT: Also, does the replacer package fix the bugs in AI Packages mentioned on the Nexus forum for the original IC Expanded? It looks like the packages have been altered somewhat so I'm guess you've fixed them but I just want to verify that.