Well makerware does a reasonable job.
But I know what you mean.
That said s3d is an investment. And as it's compatible with just about every machine out there it's not going to be obsolete if/when I get a different machine.

The alternative, I suppose, is to install a new motherboard in the machine.

For the money though you really can't beat the flashforge and equivalent machines, so being limited to rep-g or makerware is a pretty small price to pay and even if you factor in the added cost of s3d - you still have a very cheap and capable machine.