I'd be happy with 3 things. Just 3, simple enough.
1. Keep the holiday decorations, those are really nice. But please, for the love of all things good, do not leave them up nearly as long as you did last year. I don't want to finally get the smell of rotting pumpkins and stale candy out just in time to get it back.
2. Costumes. This was easily the best part of All Hallow's Eve last year. Be it the costume contest or the costumes for sale, they were both great fun.
3. Fun events. I remember the maze (which I never managed to get into thanks to the 650+ lines of the older VMK.) Also, the game wide thing where you had to follow clues to find a certain place or something was also great fun, although accessing the rooms was not. Oh well. With these new events and quests and such, Halloween has the potential to be amazing for events. Amazing DOES NOT MEAN RIDE-A-THONS! It's nice to see the rooms the first time through, but after that it becomes a grind to get tons of items. It is NOT very fun to click on a start of the track, wait about a minute, and start over. Also, please, please, please do not abuse the quests for everything. Quests are fun and all, but in order to get multiples of anything, you need to create mules to do the quest over and over again, which, if I remember correctly, is the one of the things you are against (the creation of accounts who's sole reason for existence is to gain multiple items to trade to ones main.)
That is all I request this October, and it would make me very happy to see these things happen. Thank you for taking the time to read these, be it a normal user or T.P.T.B.