• PPLNS option, currently all pulls hurted by pool-hopping
• Hidden ports for miners (my patch on node-cn-pool)
• Easy to customize, separate css, js with custom events, etc
• Fee withdrawal address, automatic with threshold
• Lightweight
• Separate daemon, api and payout daemon

I'll add some items to this list later.

BTW, I think multipools sucks, and merged-mining killing coins. If I found a time I'll join your frontend development if you are not against Ember.js frontend.