scriptdev2/scriptdev2 — comment on commit 09c4720ec871c18b041d87a7d6b1208c84bb4e08
File:  line 0
By xfurry:

There are 2 major categories of missing spells
1. Spells which existed before 2.0.1 and were removed afterwards. For these it would be nice to have a system which should implement the effects, because we already have the data regarding these spells and we already know what should they do.
2. Spells which exist only after 2.0.1 which are handled only on the server side on blizz. These are mostly achiev spells or outdoor pvp spells which we will never know exactly what they are supposed to do, and it's pretty hard to guess what should be the spell effects.

Considering this, for category 1 it would be nice to have a system for custom spells, but for category 2 it's useless because everything around these spells is totally guesswork.