I guess airbus does it differently and "protects" the pilots from violating the max derated thrust, probably to protect them from busting VMCg/a. Boeing doesn't, you can allways get max thrust or even more in the case of non-FADEC engines.
As pilots we usually talk about what we can do, and the derates we can do are temporary take off derates, not permanent ones. The latter ones probably need a bit more work than just pushing a line select key on the N1 page.
Bump sounds weird, is that something like extra take off thrust above the normal engine rating? I knew those airbuses have performance problems from our airbus fleet, but i wasn't aware that it is that bad.