So one thing I noticed that is that I have no way to turn off the black semi-transparent background that all HUDBars have.
What is shown in the photo is a custom triple-layered health bar comprised of 3 bars:
Recoverable Health bar (red)
Real Health bar (green)
Temporary Health bar (cyan)
The Recoverable Health bar's red color is supposed to be a similar shade/brightness as the Real Health bar's green, but because its the lowest layer (sitting under two other bars), its a really dark shade.
I propose, for instances where people want to layer HUDbars like me, a [nobackground] or [nobg] option gets added to the list of options usable (like [vertical|right], etc) which would disable the black semi-transparent background.