First suggestion;
Could the /pets perhaps get fixed, the pets are invisible, but I keep seeing people talk about them that they're interested in building a place and want a pet in it. I paid good ingame money etc and participated in contests to win unique ones I'd love to brag with as well (haha) but they're invisible so that's no use. I wanna run around town on my endermen

Second suggestion;
Players find out the horses despawn, but there's no information or easy interface for the /h command.
I don't even know if they can still buy horses, but when they ride a horse, it despawns,..
My suggestion is to perhaps spit out a msg there saying: You can't own this horse, try instead: /horse help