Multi-line Combinators

[Hexicube]

Combinators take up quite a lot of room when you want to do a lot of complex functions, therefore it would be nice if a combinator was able to do multiple operations in one go.

Initially they would do one operation (like they do now), but research would allow more and more operations in a single combinator, up to some specific limit (5?). Each one would be done in succession, and would affect the next lines, so it would be possible to do RED X 2 then RED + 1 to get RED X 2 + 1 in a single combinator.

This wouldn't be of much use (if any) during normal gameplay, but would be incredibly helpful for complex logic systems (such as that one where a guy was making tetris).

[ssilk]

How should the interface look then?
And before you put some work into this: Wouldn't it be useful to wait with this suggestions until 0.13 is released? because I think that update will change much.