Would be nice if you combined Scrypt/Scrypt-N/SHA256/X11 rewards before payout

They are combined together. You just don't see that on graph.
I had this exact same suggestion a while back -- remember aggregated payout that I mentioned?
The key thing here is that the payout mechanism should check the
sum payout total of all the algorithms and check whether
that meets the threshold of 0.002btc instead of checking each one individually.
For example, say I have pending balance of the following for each of these algor: scrypt 0.0017, scrypt-n 0.00006865, x11 0.00046600. Even though scrypt-n is below the 0.002 threshold, that will
still get payed out on the next payout because the sum total of all three is 0.00223465btc. I don't believe the current system is doing that is it?