This week we have re-factored our model builder tool. Creating your own blocks is way faster this time and easy to get into. We've created new official modded roof type and new tutorial describing how we made it. If you follow the instructions, you will be able to create any block you wish for.
We also added target inventory checkbox into the game - each inventory have a small check box that sets the inventory as target (only one target can be set at a time). When player starts to click on items with CTRL+LMB in any other inventory, the items will be automatically moved in to the targeted inventory.
https://www.youtube.com/watch?v=UfhYMTobsEM
Full list of new features and fixes: http://forum.keenswh.com/threads/7371494