BUR #21395 has been approved by @evazion.
create implication 6koma -> comic
This is the only one of the standard koma tags without the implication.
I also noticed that multiple 2koma, multiple 3koma, and multiple 5koma have an extremely low post count compared to multiple 4koma. I think it's extremely unlikely that there's only one multiple 2koma on this entire site. I can put in some time to populate them, but since it may involve removing some tags (such as 6koma from multiple 3koma posts), I want to make absolutely sure there isn't any reason not to.