Currently there is no way to delete unwanted scrolls (As recycling the tool it is attached to will still return the scroll to the Ability scroll bag).
New ability scrolls then get shifted into the mailbox with no way to redeem it.

This is especially troubling when you get better scrolls in the mail.

Also there is currently no way to click to access the ability scroll drawing interface other than the daily pop up at the left side tasks.

Would be good if we can sell ability scrolls for ability points like how it is for extra summon fragments, ninja fragments (For those that had reached 5 stars).