Supercharged Slam / Defensive Supports

I cannot speak to all channeled skills, but I am perplexed as to why warriors cannot benefit from "per 1/4 second" supports on skills that could definitely use them.

I absolutely understand that you should not be able to stack these buffs throughout a channeled skill. but I do believe that the original attack time can be used in place of the entire channeled time.

Example:

Supercharge Slam: Attack Time - 1 second. Can be channeled for ~4 seconds.
Unyielding: Gives 8% recoup per 1/4 second of attack time.
Unabating: Gives 25% armour per 1/4 second of attack time.

If these supports take the original attack time of Supercharged Slam (thoughout it's entire channeling), they would give 32% recoup and 100% armour, respectively.

Warriors are also working with skills like Sunder, which on my character would be a base ~2 seconds. This would give 64% recoup and 200% armour.

Please allow these supports to be used on channeled attacks using their base attack time. Specifically, Supercharged Slam is a skill that could very much benefit from defensive support, and this change could make it much more viable in the endgame.