It'd be nice if we could have a way of tagging and querying redstone sources to allow us to only take actions depending on these signals.

Main use case is for things such as ME level emitters, which would allow us to take action to deal with item overflow or maintaining minimum levels.

I'm thinking something along the lines of

if redstone source ge 2 then
    -- some action
end

I can also envisage use cases where you could turn on and off item transfer with an array of levers on a cable.