No it's disabled, bann rates are high doing that while agility.
You are better curse alching for 30 min instead of alching for hours on an agility course
Hmm it should drop burnt fish, will have a look at that!
And for the full inventory, that's why there is an option:
EDIT:
Found the dropping issue for burned fish, fixed in V2.27, will be live soon!
Thx for reporting!