Must be standing to cast

[Daldaen]

No...

It's so you could med while you were casting.

In classic you could cast a spell, sit, then stand just before the spell finishes and channel just fine. This wasn't changed until Duck interrupted spells mid Velious.

Changes should be made to make things more classic. And extremely rarely to fix broken mechanics that trivialize the game (see hoops). Fun or Challenging, meh. You could make EQ more fun for yourself adding all these custom changes if you want I guess, but it wouldn't be EQ.

Sitting to camp and Standing to cast puts a little delay between actions and slows down have quickly people play (albeit slightly if using hotkeys). This is classic.