So I do notice that a very tricky thing of the runemage is still “when can I press the second time to release the spell?”. You can press the release button twice fast and the spell will not come of your wand because your second press was too soon (so I just keep spamming still to release it the fastest or wait way too long before the second press 
).
A single press release would fix that as I mentioned in the past. Buuuut I also notice that when you listen for a perfect cast sound you know you can press the second time. Because human brains react faster on sound then visual stimulus, it always feels like an annoying delay to release a spell when you don’t cast a perfect spell (where you have to use your visual only to determine when to release the spell).
So I was thinking why not add a separate sound for non-perfect casts too? (Although, changing it to a single press would be better but a lot more trouble for the devs then just adding an audio queue 
)