How about [signal=red] / [signal=green] to read out the icon of connected circuits?

I would see a usage in interactive train station names, for example if there is still iron to mine the signal is the iron ore icon otherwise something that represents emptyness and so on. The sorting will be ...

How about R&D labs for the endgame science? That are special labs that are feeded with products to improve the stats of new produced products.

For example a R&D lab that takes inserters and green science packs, there are three different recipies, for speed, energy consumption and material ...

Any news about Paysafecards? I just want to buy the game but the option was removed
PS: I don't like credit cards and I don't trust paypal ...
PPS: So, then I have to play Dwarf Fortress a little longer