One thing that I find frustrating is that every quest marker shown above an NPC in the world or on the map, irrespective of whether its a solo, heroic or flashpoint, is represented by exactly the same symbol.
This sometimes results in long conversations, simply for the quest to be abandoned when it shows in the quest log, as a player may deliberately running solo for whatever reason (RP etc). On returning to a quest hub, where sometimes new quests appear after hand-in's, you then have to run through the whole process again (possibly even with the same NPC if its been a while since you logged in) if you can't remember if you spoke to them before.
In short, create a new 'quest available' marker for group content.
- Soloists can avoid cluttering their quest logs if they wish
- Guilds/friends know who to speak to if they simply wish to only play heroics in a zone and are grouped up
- Quests can be shared in any event, so if a group if formed whilst out adventuring, then this will still allow someone to have it shared with them