Combo Smoke/CO

Many states are requiring both sensors now in their fie safety laws.   All major detector companies sell nice little dual units. COVE sells a dual unit now for their very similar system.  When I signed up for Simplisafe the rep told me 'you were working on having one'   which I gather was not really true, but it did make the sale. 

It seems like such a simple thign to do, which would make you lots of money in unit sales.   As well as keeping up with what COVE is doing.  SO why don't you make one?