Currently, there are only 2 monstets that do sleep/curse (slooms and phantoms), making sleep/curse trinkets almost useless.
Make more curse/sleep monsters! I beg you!
Trojans, for now, do not have any status themed versions. Fire/Ice/Shock/Poison trojans would be AWESOME.
Curse is covered by the new FSC that's coming; as for sleep, I think they didn't like the idea of taking away a player's ability to do anything so they canned all the monsters that can inflict it.
I agree about the Trojans, although they currently do inflict shock during their "TROJAN MAD" attack.