The Powder Toy is certainly an interesting sandbox for all sorts of physics and electrical fun, especially in the customization available in the LUA console. In the spirit of adding computational functionality to TPT, i'd ask the Devs to consider the benefit of a new electronic or special pixel which would execute LUA scripts when sparked. When placed, the pixel would request a LUA input which, when sparked, would be executed. I think that this has many exciting possibilites.
I like this idea, but what lua scripts would you like to exclude and during what type of save.
you should do a search of the forum. this idea has been rejected many times by the devs. that is why we have the DRAY particle. it is as close to a command particle as they want to get.