"no development, old codebase and slow wallet" 

I'm actually still around (creator of clam here) and recently posted a updated client to github..  much improved. Put clam into a much newer codebase then the peercoin code it originated from.

Its still in beta, and ive been waiting to hear more feedback before pushing it onto master.. but if you check the releases on github.com/nochowderforyou/clams you'll see a new beta release for 2.1.0

all 3 of those points are kinda take care of there!