It would have to be set up one item at a time (with decisions about primary color goes here, secondary color goes there, etc) and there are a lot of dyable gear items in the game, so getting it complete could involve a lot of work. But I'd really like if they'd set up such a system, even if adding it to individual items would have to be phased in a few items at a time. (And even when complete, it wouldn't include everything. Some gear pieces have obvious multiple parts and others don't.)