I'll second (or is it third?) the Lootbox Purchasing, Inventory Cleanup, and Editor Improvements.
However, the Board Customization might be a little tricky seeing as how they would need to work in all the new data into the physics of the game since the board would be longer or shorter and the truck stiffness would change how every skater turns in real time, as well as the speed from the wheel hardness. That's ALOT more data to account for on live servers from every single skater in every single lobby. Unless they just add that in and don't account for it, which would defeat the purpose altogether.
The Map filters I feel aren't completely necessary since u can still navigate the map fairly easily when searching for challenges. What I find annoying is having to hover over each challenge icon to find the ones with higher rewards. Maybe a filter that can single out the challenges that offer the higher rewards or just adding that detail to the challenge icon would be nice.