I'd love this feature as well! A workaround that I found was to, basically, give darkvision to my non-darkvision PC tokens, and extend the range of my darkvision-having PCs by another 60 feet. Normally my elf PCs have "emits light 60 feet, dim light starting at 0 feet". Now I've given that setting to my humans et al, and given my elf PCs "emits light 120 feet, dim light starting at 60 feet". So it basically looks like dim light for everyone without darkvision, and bright light for those with it.