What I would like to see is Adventure Compendium consolidation such as:
Instead of being 2 lvl 3s, 2 lvl 4s, 2 lvl 5s, 2 lvl 6s and 2 lvl 7s Splinterskull could be changed to 4444/55/6666
Sorrowdusk likewise could become 7777/88/9999
Threnal could be moved to straight Lvl 10s
Delera's Pt 1 could be moved to Lvl 6 to better fit in with the rest of the chain.
Tharashk Arena and The Prisoner could be moved to Lvl 9
STK Pt 3 could be dropped to Lvl 4 {All this would require is a slight reduction in the Trap DCs and removal of Flamestrike from the Hobgob casters!}
The final part of Catacombs could be dropped to lvl 3 to fit in with the rest of the chain and could have it's XP doubled!
Chamber of Rahmat could be pushed up to Lvl 11 {same as the rest of the Sands walkups - I personally think this is slightly more difficult than Kourush anyway!}
Offering of Blood could be pushed to Lvl 12 {same as Chains and Wiz King!}.
Shavarath Flags could be moved to Lvl 20 and given Epic XP!
In the Demon's Den could be moved to Lvl 20 and given Epic XP!
Arachnophobia could be retooled as a Group Quest with N/H/E difficulties and 2/4/6 Favour
An Explosive Situation could be retooled as a Group Quest with N/H/E difficulties and 2/4/6 Favour
Miller's Debt and Home Sweet Sewer could be dropped to Lvl 1 and moved to Korthos Village {Remaining Solo}.
The Captives and Where there's Smoke could be dropped to Lvl 2 so they actually fit in on Elite with the Cerulean Hills Slayer Max Level {4}.
Waterworks Pt 3 and 4 could be dropped to Lvl 3
Depths of Doom and Discord could be dropped to Lvl 4
Sunken Sewer and Missing in Action could be upgraded to Lvl 3 - For Sunken Sewer this could justify making certain optionals none optional!
Swiped Signet could be moved to Lvl 4
Proof, Irestone, Freshen and Rest for the Restless could be moved to Lvl 5
Lair of Summoning and Chamber of Insanity could be moved to Lvl 6
Redwillow's Ruins and The Bounty Hunter could be moved to Lvl 7
The Pit could be moved to Lvl 8
Xorian Cypher and The Haunted Library could be moved to Lvl 9
Hiding in Plain Sight could be dropped to Lvl 9 {so people can actually get into The Restless Isles before they outlevel it!}
Made to Order, Dreams of Insanity, and The Enemy Within could be moved to Lvl 12
Relic of a Sovereign Past could be dropped to Lvl 11
Make Mama a requirement and push Mired to Lvl 14 {guarantee at least one Scale Drop}
Lords of Dust {drop to 15} could swap places with In the Flesh {move to 16}
And Murder By Night does not belong at Lvl 19 when Druid's Deep is Lvl 17! - It makes zero sense for you to ask about Werewolves when the Druid's Deep NPC tells you something's gone wrong at the Hospital when you shouldn't even have run Murder By Night yet!
It may require retooling the mobs CRs etc. but Murder by Night should be dropped to Lvl 17 base!