Set availability (time wise) for each user on a per project level

Dear Madam or Sir,

I am a new GreenHopper User currently getting used to it and I've already created a support issue (https://support.atlassian.com/browse/GHS-117) with a couple questions which turned out to be not supported, yet.. and therefore I'm creating Feature Requests for these one by one (to keep them separate from each other).

Particularly, I would suggest that it's possible to set time available per day (per project) on a per user level as well .. on top of the global settings (e.g. most developers work 7-8h/day total, most work on one project, but others do work 3h on project A but 5h on project B which runs partially in parallel to project A etc).

Cheers,
-J