I guess that would entail that C2 be aware of other apps (like Kagu) and also do a search if Kagu or other media apps are installed or not and if yes, do a search of Album art from their repective locations.

Also some other 3rd party apps might not have album art support also like C2 itself, so that means C2 has to have a database of which apps have album art support and then do a search accordingly.

Sounds like quite a convoluted process.

I think its better that C2 incorporate the Album art search in C2 itself (legal matters permitting).