Do:
1. Collision in PvP (as well as PvE) with contingencies to prevent griefing.
2. Housing in the vein of LOTRO (phased neighborhoods) with the customizability of Rift.
3. Dueling with group and guild duels with the ability to auto-deny all duel requests.
4. Add group leader indicators in PvP.
5. Make horses actual animals that can stand around independent of their riders. Give people the option to turn seeing them off.
6. Make players move siege engines from friendly to enemy territory instead of just pulling them out of hammerspace: http://en.wikipedia.org/wiki/Hammerspace
7. Speech Bubbles in the vein of LOTRO with channel toggles and them defaulted off.
8. Make anchors and/or fissures dynamic instead of static.
9. Add weight and encumbrance to the inventory, remove slots. Start at 155kg, every level add 5kg for a total of 400kg by level cap. Buying better bags can add more encumbrance. Max should be around 500kg.
10. Ability to swim, fight and explore underwater (but no underwater questing).
11. Take away level gates on quests and mobs, use phasing to scale areas allowing people to go and quest anywhere they want.
12. Add quests everywhere that only appearing when players reach a certain level, rewarding exploration and backtracking and discouraging connect-the-dots mentality.
13. Actually let us sit in chairs in the world. /sitchair is not doing it.
14. Allow emotes to override menu emotes so if you are playing the lute and you want to check your skills you can do so and keep playing the lure.
15. Allow sitting and mounted to override emotes so you can eat while sitting (right now you stand up) and can wave while mounted (right now your horse disappears).
16. Add an Arena, one in each faction zone. it can not be teleported to and is not an e-sport. Individuals and groups can sign up to fight each other but must do so on a schedule. People should be able to bet on the fights and watch them from the stands.
17. Add a "custom class" option allowing us to mix and match 3 of the 12 class skill lines.
18. Allow the ability to add ranks to guilds up to 20.
19. Allow guilds to show character names instead of player names on their roster.
20. Allow guilds to limit the races that can be in their guilds.
21. Make players need to have relevant tools in their inventories in order to perform certain actions. This includes gathering resources, fishing and playing instruments.
22. Fix group phasing.
23.Make groups override phasing and objectives in ALL circumstances.
24. Allow group members to accompany you ANYWHERE including story instances. Scale for difficulty of course.
25. More beards.
26. Separate adornments from beards in character creation.
27. More body and face tattoos with color options.
28. More lore-based mounts beyond horses, like Senche and Guar.
29. Skill gain via use.
30. Get rid of levels completely, just use skills and attributes for progression.
Don't
1. Add flying mounts.
2. Use real-world holidays in-game.
3. Go free-to-play/pay-to-win.