I have been playing Lineage for over 4 years, and I started playing WoW about 1 month ago and I see the difference...
WoW is (in my opinion) by far better than Lineage, for many reasons.
anyway, webm0nst3r nice share, though I think that generally if you cast a spell with cast time at least 1 second, and the global cooldown ends before you finish the cast, you can cast any instant spell WHILE casting the first spell.
for example
you're a Moonkin casting Wrath.
The moment the global cooldown ends, you press moonfire button, and moonfire will be cast to the opponent, the moment wrath is finished being cast without refreshing the global cooldown
(wrath will also damage the opponent)
at least that works for me in WoW Official servers