I used some mods to accomplish the image below (its not actually perfect, but is on the decimeter mark), and they are:
MechJeb2 (pointing me to the right direction, and limiting my engines to as low as 0,000001m/s)
Kerbal Engineer Redux (for detailed orbital info)
First, I used MechJeb to create a maneuver node to put my inclination to 0º, which wasn't perfect (but still useful to know WHEN to burn), than I created it again to kown when to burn and burned manually by using the tool "Limit acceleration to:" under "Utilities" on MechJeb to block my acceleration to 0,00001 (or something like that), once my inclination was non existing i rose my apoapsis and then my periapsis using a very, very low acceleration (thanks MechJeb) to fine tune it, than maneuver node again, this time to semi-major axis, manual burn, increasing the acceleration restraints on MechJeb until it was on the spot.
Results?! See for yourself :3
Again, not a PERFECT geosynchronous, but a REALLY close one, the best I could do with lots of tools in my hands, maybe a better orbital information mod....