While I'd love to see this I suspect the best method of adding it is to add a super slow time factor, something like 1% speed. You can already slow things down on the fly in single player (I believe, haven't tested it out yet) so if the slowest speed you could choose allowed for huge amounts of time to issue orders in it would let those of us who wished to eliminate the "real time" aspect of real time strategy.
For those of us with limited reactions, the alternative is to remove the "strategy" aspect.
