I thought about that but it would in my opinion over-complicate the user interface. Not from the user's view but depending on the mode there needed to be different options/labels which is quite error-prone in the long run. Also, the question might arise whether 6dB should be added or all filters should be halved (e.g. 6/12/24 instead of 12/24/48). I considered this (as it also affects the peak/shelf filters) when adding the minimal phase mode but decided against it. For 6 dB filters you can use TinyQ but I understand that using a second plugin might not be the ideal solution.
Instead of different colors (which is already used for coding the routing) I thought about highlighting the handle/bands if the mouse is over. But as this is a bit of work I'd like to know how large the demand is for this change and if it would even be a satisfactory solution