This addon is amazing, but it's missing the casts until oom on shapeshifts. It would be really good to know how many shifts i have untill oom on the druid.

That's not a bad idea. Casts (or time) until OOM overlay should now work on non-evaluated spells like shapeshifts (although not on the stance bar) in the master branch which will go onto Curseforge at some point.