I am sure they could do more, however it all comes down to cost,
They are hard to sell with the current pricing so adding a few hundred dollars would not suit most Hobbyist.
The main problem with making changes i quess would be that they would have to change the way they make them in the factory which would add huge set up cost,
also the red sea brand is not a top quality brand and cover the mid range market.
The Jewel tanks look very promising and looks like you can add bits to them