I would love to see some more interior furnishings, as decorations or some functional items. Items such as:

• More Chairs, Armchairs
  
• Benches
  
• Couches and sofas
  
• More tables
  
• Desks
  
• Shelves
  
• Armour, wall locker, dressors
  
• Cook stoves, ovens, wash basins
  
• Bathing tubs
  
• More lighting options, candles, lanterns, shandeliers
  
• Fireplaces
  
• Workshop items such as looms, spinning wheels, workbench, cloths washing tub, etc

Basically tings that you might find in a lived occupied place where people are living and working on a regular day to day basis.

I would build these myself, but my 3d modding skills are not up to the task and I do not know how to create mods for Midieval Engineers yet.