Can you link to these threads?
I want to understand the issues experienced.
I would imagine it requires a whole different wire harness from a vehicle that had a power lift gate, plus all the parts motor, lift arm, etc
then programming to boot. All of that probably requires tearing half the vehicle apart to do the wire harness alone.
I say this because there is a button up front in the roof console that is needed if you do not have that button already then you do not have wiring either.
there are safety features integrated as well so the gate cannot be opened if you are moving (that's part of the programming and maybe even additional wiring to the transmission or something.)
you would also need to change fobs and program those
to put a twist on that they changed wiring in 2010 and 2007's had a different front roof console
it's no simple task by any means
but if you are bored and have lots of money and are a expert at reading vehicle wiring diagrams and troubleshooting then go for it.
reality tells me to sell it and just go buy a higher trim level