I don't know if these have been suggested already but looked and didn't find them.
-Make stronger buffs overlap weaker ones, similar to retail DBO (so we don't have to remove a weak buff every time we want a better version of that buff)
-For CC, have the mobs on non-boss floors be in groups like in retail. It's more efficient in pulling mobs for the "easier" floors and more challlenging for the harder floors since you won't be able to just attack one mob without agroing the whole group.