Ahh Genesis, one of those spells that causes issues because people don't look at other forms of it.
Sadly, the Spells SRD were not updated with the errata, but the
Psionics version was properly detailed as to NOT allow for Time traits, or specialized features (at best you can make simple terrain of hills and valleys of inert dirt).
If you believe the Time side of things is the important one... Why do you care about all of that when, if you follow Greenfield's format, you can just breed an army?
Boon Traps of Create Food and Water for feeding the hungry masses and a constant battle to ensure XP gain. Steal 12 children, lock them in the plane, come back in a day with a Living Construct who can train them. Create another Genesis 180 feet away, and let the magic happen.
As long as you produce wooden weapons and other materials, ship in occasional other items, and keep your Living Construct minions alive the Planes will merge and collide at SOME point (if you use the 'add plane' feature) around 1000 years after the Genesis effect is triggered on the one side. Teach them to battle each other, gain power, create an entire culture...
And you'll have yourself some delightful people to populate your new keeps, who have spent thousands of years being indoctrinated that you are likened unto a GOD.
Slainte,
-Loonook.