The entity remnants were really missing in the game, the first, specialised one for the wall is now in the game.
The wiki is up now(viewtopic.php?f=3&t=1363
), so I started to do revision of the scripting info there just to find that it is quite off in some places. Updating the wiki and refactoring and restructuring some of the scripting interface inside Factorio was my work for most of the day.
I was also extending the scripting interface, so things like this can be done: viewtopic.php?f=28&t=1338
(check the video of turbo car and race track).
Tomas created attack reaction mechanism for entities, so things like spiked wall and similar can be modded easily.
The rest of the time is filled by bug hunting and fixing and reading the forum.