Factorio Forums

An useless entity type would be really usefull in mods like my mods (for the underground mining drill, that now drops the items on the ground like a normal mining drill) or for the ccmod (warbanner)
And Im sure that there will be much more things where this would be usefull.

or (eventually) the ability to code our own

There will (eventually) be a custome lua entity. That will be really powerful. On the other had it is quite a lot of work to get done:)