Hello again, and thanks for the feedback! I do have plans for consumable items, and it is probably a feature I will be adding in the near future. I would like to start building the related mechanics out a bit so I can implement things like player damage through scripting (traps, harmful tiles, etc.) as well as player death during combat, so having healing items would make sense to include as well. At the beginning I will probably set it up so you can indicate an item is consumable and attach a script to it, then add functions for things like restoring the player's health.
I'd definitely also like to include more support for custom properties like you mentioned for entities and the player, but that will probably be a bit later on. Hopefully that helped and I was able to answer your questions!