Originally Posted by Küken
It is actually not that hard; for example if you use Anitarf's SpellEvent System and only triggered spells, you can achieve spell reflection easily. However, this thread is about stuff, which is not codeable in Dota with a reasonable amount of code changes and invested time. Any attempt to make spell reflection work in Dota would require a huge amount of time/code/testing, so yes, I would call it uncodeable.
We are talking about a SINGLE-TARGET abilities.
There are simply too few single-target common-sensual reflectable abilities to worry about them. If I weren't so lazy, I would even list them.
The difficulty in spell reflection comes with eventual graphics glitches but I guess they won't be hard to fix, for example, with a huge and flashy animation.
So name me an ability that you think cannot be reflected (i.e. its reflection is uncodable or requires an OS-type coding) and I will try to code it for you.