Skills need better tags

Example:

Explosive spear has a "Duration" tag on it. I pop any skill effect duration support gem to it, absolutely nothing happens. Detonation speed doesn't increase/decrease (because apparently there's zero way to change this built in gimp), ignite duration doesn't increase/decrease... Literally nothing happens to the gem's stats. So what in the world is the "duration" tag for, and why does hovering over a duration support gem say it's compatible (but completely useless)? I had Overabundance and Fast Forward plugged in thinking it was doing at least something to make it pop sooner. But, nope. Had to sift through pages of flavor text to find the right explanatory tag that told me I was an idiot for not knowing detonation speed can't be changed.

Remove Duration tags for skills that last any amount of time but can't be affected by duration skill gems. Thanks