I manually scroll through my magic list very often; As a GEO and SCH, I don't have the space on my macro bar to macro every spell that I need to use. Along with that, I've learned a ton of magic that I've never actually used such as miscellaneous Bar-spells or even -na spells... having a WHM Trust NPC around pretty much allows me to never cast such spells.
When I'm scrolling through my magic list to find the spell I'd like to cast, it usually takes me an inordinate amount of time to find it because I have to scroll and jump all over the place. Needless to say, I spend a lot of time just trying to find the spell I want to cast.
Can a feature be implemented to "hide" spells from your active spell list? Being able to hide spells that I never use would be helpful and a time-saver. Of course, you could always just manually type it in as a /magic command (since you actually know the spell) or "unhide" it from your active spell list if there was some situation where you needed the spell again.
Alternatively, if that's not possible, could you just add an NPC that makes you forget spells you've learned? I've learned every Bar-spell and -na spell, but I honestly don't think I've actually casted them... ever. Again, the WHM Trust NPCs are usually infinitely faster than I am to cast such spells. There's no point, to me, of even knowing the magic anymore. They've added a NPC in a very old update that makes you forget that you ever completed your AF quests, so I know it can be done.
It's an odd request, but it's something I notice that happens to me every time I do anything in the game.