Sandbox Consistent Player Customisation:
- If a player has the Human Model selected they shouldn't be defaulted to the Citizen Model when entering Sandbox.

Sandbox Playermodels:
- I think a Playermodel system should be introduced (similar to GMod's) offering community-made Playermodels while also keeping the first initial model the default player's customised model. The selected Playermodel should save between sessions of Sandbox and players should be able to save Playermodels to their own "model lists".

Sandbox NPC Interactivity & Simple NPC Template:
- Right now the Scientist NPC lacks environment interaction such as blood splatters on surfaces or interaction with the Physgun which just makes him feel boring to interact with.
- I think it would also be helpful to provide people with a simple NPC template to make the creation of NPC's easier.

More / Improved Surface & Gun Sound Effects:
- Personally I feel that the current roster of surface types and gun sfx are limited and have very repetitive and obnoxious sounds. (Especially flesh, glass, and metal surfaces)

Official Mount Prefabs:
- Since S&Box now supports it, I think it would be nice to have Official Mounts such as Half-Life to come with working NPCs and interactables, and later down the road hopefully HL2 and HLA.

I wonder if random item drops ( Like in TF2 ) would be a good thing to add, it would motivate people to play more