If we try to put an item on a table it falls through. We can adjust the hight of things but that's fiddly and i have not got that to work yet. It may be an artefact of my build or the server I went to but if it is not then might I make a suggestion or two. Shift_d where d is 'drop' has no function yet. Making it place objects ~0.9 metres from the mean ground surface will seem to put things on a table. 0.9 is a guess of the butchers table surface hight. Adjust accordingly. There will still be anomalies if the table is not on level ground but that's minor. On the inventory menu I would add a place button with the same function.
Jump is always fun and often is able to get you over an object or unstuck. J is unused. Making that jump may be a reasonable long term option. If the avatar retains forward momentum and the collision test is negated in a jump then It can get you unstuck and add fun to the game.
Is there a plan to do a transactions menu or a pop-up price list on buying and selling. Typing "I would like to buy a pig" is cumbersome and if you don't know what's what its a problem.
A trade button on the inventory would work but should work only if a merchant is selected. An NPC class merchant would be needed.