this is an issue they are aware of, but shelved it at the moment. It isnt as simple as adding a collision box to players, because players respawn when they die/disconnect from server, so there are a host of abusive issues with collision boxes (google "logging through doors, asherons call) where you can stack people on top of spawn locations in order to reposition the person logging in based on the collision box.
anyway, the solution is to add collision boxes, do a "non-collision cooldown" after spawning", and implement "non collision with no weapon drawn (ie: respawning/disconnecting)" and test them all out.
these issues will be addressed later on, garry is currently running on like 3 hours of sleep working on a item world editor so that his team can implement changes to new items and their functions faster, resulting in more content and more updates.
Edited:
view the trello if you want to see how many hours he's logging on development, and what he is currently focusing on. The item cards themselves will let you know what he's aware of, and the "recent activity" will show you what he's pursuing TODAY.
Also keep in mind he's working with implementing the new Anti-Cheat program. his time is divided.
Ohhh those where the days in Asherons Call :) DT for life, sad fact, AC is acutally dieing. In the next month or two it will be F2P for anyone who was a subscriber, but that's it. With the release of the server code to users in the next year or so for those who want to run one.
Back on track: Yeah the melee combat really needs collision control but as previously stated, it is not a simple switch they can turn on. There is a host of issues they will probably have to tweak / work through.