Something I've always wanted to see a server do, but never really had a discussion on: Love for pure-classes. Bare with me.
Generally speaking, multiclass characters are going to be better than single-class characters. Just picking up a level in a second class is an immediate boost to your saves, and usually provides you with access to new skills in addition to new abilities. Theoretically, the cost of this is decreased power of your primary class but in practice this isn't always the case. In my experience, they generally break down as follows taking into account that Ravenloft requires effectively 5 levels in a secondary class:
Pure Tier
You're generally better off taking these pure than anything else.
Sorcerer, Wizard, Paladin*, Monk*
*Required to be Pure Class, so moot point.
Strong Incentive Tier
Completely viable contenders as pure class, though there's an argument for dipping 5 in another class.
Cleric, Druid, Rogue
Theoretically, Yes Tier
Classes that have some incentive to maintain pure, but dipping into a few levels of something else is a serious improvement
Barbarians, Bards, Rangers (maybe)
No Particular Reason Tier
Is this ever pure-classed?
...Fighters.
Pure Tier classes seem completely fine in their current implementation. It's a serious sacrifice to leave the main class for a few levels (or impossible). The Strong Incentive Tier is the sweet spot. You can certainly dip into other classes from those, but you're giving up something important to do so. Rogue is probably the weakest contender as it does perfectly well multiclassing but there are definite advantages to sticking pure rogue.
Theoretically Yes is where we start seeing some classes show their weakness.
Bards are arguably in the Strong Incentive tier, but it's so common to see them take a few levels of Fighter or Barbarian to round them out that the number of multi-class characters far outweighs the pure ones I've seen. The biggest argument would be losing access to level 6 spells on Ravenloft, which may or may not be a big deal. Bardsong could be an argument as well, but the difference between a level 15 bard's song and a level isn't as mechanically huge.
Barbarians theoretically work as pure class, they at least continue gaining mechanical bonuses from 15-20, but in practice this amounts to slightly increased damage reduction (4/- vs 2/-), a slightly increased reflex save vs traps, and 2 extra Greater Rages per day. Not terrible, but taking 5 levels of Fighter for Weapon Spec, extra feats, and heavy armor or 5 levels of Rogue for Tumble, UMD, and 3d6 sneak attack damage (both options improving saves) seems like it heavily favors the multi-class Barbarian.
Rangers are the weakest in this tier. The difference between a level 15 and a level 20 ranger is effectively +1 to favored enemy damage, HD on an animal companion that (at least on servers I've played) isn't capable of taking enemies that level anyway, and slightly increased duration/castings of their relatively unimpressive spell list. The thing that makes this one a real kick in the butt is that the archetype people want to play as a ranger is generally more skill-based, meaning that you'd actually be a better ranger by taking fewer ranger levels and more rogue levels. Rogue synergizes so well for this class it's hard to argue not taking it - 3d6 sneak attack damage, a whole mess of extra skill points (that rangers desperately need), access to Tumble/UMD, and an increased saves.
Then you have Fighters. A level 20 fighter would have an extraordinary number of feats, but that's about it. On a server where feats are plentiful (that's awesome, by the way) there's no reason not to multiclass a fighter into something else, usually rogue.
Would it be beyond consideration for some of the classes that are the weakest contenders for pure-class to get some kind of boost to make it more attractive? Particularly since anything that isn't a dedicated spell caster tends to be better off with a few levels of rogue or fighter sprinkled in (extra skill points, sneak attack, or heavy armor, weapon spec, and better saves either way). Fighter, Barbarian, and Ranger seem like they get the worst of it, since they all benefit so massively from mixing in rogue for sneak attack/tumble/UMD.
What I would really like to see is something to kick in for these at 16+ that would provide a good incentive to play a fighter, barb, or ranger (and to a lesser extent, Bard) as a pure class. I have no idea what that would be, but I think it would be worth talking about.