A list of currently broken Mage skills

I've found a couple of mage skills that are flat out does nothing at all with various testing:

• Multiplicity: Projectile abilities launch an additional projectile
  • Does not work at all. Tested with Arcane Shot, Dark Squall, and Entropic Sphere which are all projectile skills.
  • This is "fixed" now. What it actually does is it releases a light attack projectile whenever you cast a Projectile spell (except for Entropic Sphere which does not work). The description is misleading in my opinion and should state that it releases an light staff attack instead. 
• Keen Insight: [Control] abilities deal an additional 150% damage when activated in a 6-meter radius.
  • No observable effect with Dark Squall and Ice Blast which are Control skills.
• Bombastic: Arcane Shot now detonates Sundered enemies
  • Arcane shot already detonates without getting this upgrade, so it's likely a bug on the default Arcane shot stat.

Non-skill related Mage bugs:

Staff Enhancement "+1 Light Staff Projectile Count": Does not work at all, effectively wasting your enhancement slot. It's quite a significant milestone for mages and it flat out does not work. Tested on all types of staffs and through other people's reports.