Yes. Click on the Sepia Gold or Ferric Sulfate box and a dropdown menu will appear. Choose the Custom option and your choices will appear. It may not look quite as fancy as the LR or C1 versions, but it is very effective. Have fun!
Got you, I do have access to that but am finding it’s just not as robust as I was hoping for! I’d like to see a more developed module for that (and ideally not have to buy the Filmpack to access it, though as it happens I already have that… I don’t think it’s fair to ringfence core functionality in that way).
if you look at your screenshot, you can see split toning is composed of highlight and shadow that only hue and saturation can be adjust, then a “balance” to add more or less on one side over the other.
Color grading has highlight, shadow and midtone, which have more control on hue and saturation adding balance and blending ability.
Looking at my screenshot (fp5), you can see colours are limited to 6 colours to choose from, not a full hue range, maybe fp6 has full range but I haven’t tried it or looked at.