If I could have 1 feature added to the game, it would be a source of light that doesn't take up a weapon slot.
Some players have suggested allowing Buggies to provide light, but I think there would be a lot of proximity and pathing issues that would make it unreliable compared to a touch.
My first preference would be to add a new item slot specifically for a light source (e.g. Lantern slot). I understand there is an argument against this due to Grounded being a survival game, so another option would be to use another item like a Trinket or Helmet.
In any case, alternative light sources would be a massive QoL change for players that want to play in their preferred combat style all the time, not just during the day while outside.