RDM, "transpose" for condensed buttons!

[LilimoLimomo]

Still, anything with macros is bound to have flow issues.

This is absolutely not the case; once I understood how to put together a solid macro, understood how to use macros, and stopped trying to get macros to do things they can't comfortably do, I stopped having any flow issues with my macros. But there are so many misunderstandings about macros, and the game never teaches players how to use them, that it's easy to make these sorts of mistakes. Hopefully I can help you avoid some of them!

If you're not getting queuing out of your macros, it's because you're not manually writing queuing behavior into your macro. To do this, you need to repeat the same cast, and then the game will try to do that cast once per frame. Here's an example with one of my RDM macros:

/macroicon "Veraero"
/macroerror off
/crosshotbar copy RDM 6 RDM 1
/ac "Veraero"
/ac "Veraero"
/ac "Veraero"
/ac "Veraero"
/ac "Veraero"
/ac "Veraero"
/ac "Veraero"
/ac "Veraero"
/ac "Veraero"
/ac "Veraero"
/ac "Veraero"
/ac "Veraero"

So with that, I get a good spread of frames for the queuing; for most framerates it's not as much queuing as a normal action, but personally I've found it to be sufficient for my needs. But everyone has different systems and different needs, so if that's not enough for yours, that's valid.

I use this style of macro for all my black or white RDM spells, so that when I press the button to cast, it automatically copies over the spells for the opposite element. And like you're suggesting, I also have two Transpose-like macros so that I can manually swap without casting, for those times when the mana balance gets off kilter and I need to course correct:

/macroerror off
/crosshotbar copy RDM6 RDM 1
///// switch to black

/macroerror off
/crosshotbar copy RDM5 RDM 1
///// switch to white

Just place these on all the appropriate crosshotbars and you remove the need to slot twice the elemental spells! You shouldn't have any flow issues. Hope this helps!

And in case it helps, here's a video I clumsily threw together to show my macros and demonstrate how the hotbar is affected during use; note that my Jolt spells are in macros that show the icons for the oGCD's I've paired with them: https://www.youtube.com/watch?v=Y9w89ciAzJI