So one thing that I think needs to be a thing in GT is the ability to convert GT EU to RF.
A feature like this would be huge for a GT based modpack and would remove the need to use a mod like Power Converters (Which almost dropped GT EU support) but even then that solution is more of a work around.
I think having a specific machine in GT that could convert the energy types with a lower energy loss with higher tiers would be a great addition. With the most popular power API being RF (And has been for awhile) more and more new and awesome mods are using this as a standard and there just inst really any GT-Style RF energy production.
Well, converting to IC2 EU is possible, and then if you have PneumaticCraft or Galacticraft, you can use those mods to convert too.