Hit markers shouldn't be triggered by grenade damage. Vortex grenades make the crosshair light up like crazy, it's silly how long it can keep blinking even after leaving the combat area.
It would also be nice if you could indicate what activity you're interested in when you show up on friends lists. Right now it's kind of hard to judge whom you should try to invite for a quick Crucible match or that infamous all-day endurance run Raid.The biggest thing I want is to be able to show people that you want them to join my fireteam. For example if you're dancing and you can toggle a banner to appear above you saying "REQUESTING FIRETEAM MEMBERS" so that people can come up to you and join you