Can you add an option, so that the raid frame groups are stacked from bottom to top if they are horizontal?

I have no idea what you are asking. Are you talking about the indicator icons? Or do you want me to rearrange the raid frames themselves?

I believe they're asking about the frames. Default Blizzard frames don't sort bottom -> top, they sort top -> bottom and there is no "grow up" or "grow down" options. The focus of this add-on is the indicators themselves, so this request doesn't really apply to the contents of the add-on. You may be able to find something else on Curse which does what you're asking to work alongside the indicators, but you'd have to look for it.

Yeah, I mean we do some very basic general stuff like scale, alpha, out of range distance, etc, but this seems pretty large of a change. I'm not sure it falls into the purview of this project

The addon is called EnhancedRaidFrames and sorting of the default Blizzard raid frames from bottom to top or right to left are an enhancement over the the default options Blizzard has allowed/implemented in the options menu.

This isn't an easy request though. It's actually quite involved. I'll consider it but I'll have the weigh the amount of work it will take