I was thinking that, since Super Brawl 2 and Super Fall Brawl were added, why not add Jingle Brawl, Super Brawl and Super Brawl Summer (especially the last one, since it's extremely similar to Super Fall Brawl aside from the theme)?

I like it! And as the topic says, there is a need for more categories, or rather subcategories. I've never seen a single submission from the Fossil Challenge, and it takes a bit of time. It may be a bit stupid to suggest, but maybe have parts of the challenge as separate subcategories?