What I could come up with so far:

Make descriptions AND roles mandatory.

"Punish" or inform people who are breaking RP instead of rewarding the opposite making RP the standard and not some "Immteraction" worthy bonus for those who know what is smiled upon.

Allow only the person who delt the killing blow to be able to take things from a corpse. I have seen groups of evils and one gets the kill while the others take all the gear. From a RP perspective this doesn't make alot of sense, evil's probably wouldn't be like "It's allright, I did all the work, you get all the spoils" I suppose you could have an option to "corpseshare" which allows others to take from your kills, but it would allow more RP around PKing than before. More reasons to hire a mercenary, and more reasons Battleragers couldn't full loot. Of course their are ways to destroy a corpse so only allow that person the rights to trophy, butcher, embalm, etc...

Create a room (in every town?) in which players of every guild could enter with the understanding that negotiations would be taking place. It would have a guardian (that wouldn't allow you to enter if you were bloody?) Now the only time a Elf meets a Duergar doesn't have to be hack n' slash, they might be able to convince the other to "repent" as I hear so often by some followers of certain gods, and earn EXP or bonus for that. Or maybe a Fire giant persuades a Storm giant to turn from his goodly ways, embrace the darkness, and take the bloodoath. Of course negotiations will turn bad, people will get killed, but at least there is a small opportunity to say a few things, or emote a few things, or do some really cool RP before you get pincered or slept.

On the same point. The Outlanders and the Tribunals have some really big issues with one another, how often do they get to explain their positions? The BattleRagers and the Scions are nearly night and day, do the ragers ever get to explain why they have come to hate magic, or the Scions to show their intelligence over the seeminly moronic barbarians? I'm not saying have a tea party, but with the exchange of words comes better understanding of characters, they can respect each other as foes, battle constantly, and enjoy it more I would think.

This is somewhat obscure but since the introduction of morale, perhaps the wearing of a recently desceased foes armor would lower your morale for a short time, or long time, depending on the relation. For example, a Fortress warrior wearing the gauntlets from a recently deceased Imperial or Scion wouldn't make him feel too good, they might smell, they may even feel like the armor or weapon help take the lives of many innocents and so on. On the flipside, an imperial who wears armor or weapons from an outlander may feel the power of the laws of nature, and dishearten his quest for imperial law and its domination.

Ok, can't forget about the Inn of the Eternal Star. To bring back the Inn's credibility and put it on the VIP's list I would suggest more Immortals visit it. Perhaps Kastellyn ventures to the Inn sometimes and relays stories of legends, or Khasolothas preaches the word of the empire. Most importantly, they would Command Respect, and would raise the bar on what is being said, and who visits there. So maybe those two don't want to have anything to do with it, then a Herald Immortal could do it, contests, prizes, stories, jesus if people don't think that is fun I'm going to play a different MuD