P: Add custom colors for colour coding layers and groups

Wouldn't it be great to be able to use more colours than the 7 defaults for colour coding layers and groups? They're a great way (along with proper naming) to organise complex documents, but having only seven default colours to choose from means they start to become duplicated which pretty much defeats the purpose.

Would be really useful to have the ability (much like with Indesign and Illustrator) to use a wider palette of colours to colour code layers and groups.