From Vassal
User Interface
Clean, modern
Code Base
Cross-platform. Support as many platforms as possible, but definitely those already supported: Various Unixes, Mac/OS, Various Windows. Options for future expansion to tablets, android?
Clean code base with Unit tests incorporated from the start.
Security on server rooms
Security of hidden information in saved games and passed accross network to clients. Public Key Cryptography?
Servers, Clients, Networking
Remove single point of failure with current server
Build server into client so any client can be a server
Central Vassal Server becomes a Central tracker tracking which servers are currently available and what games are running. Dice Server?
Module files, saved games, log files
Human readable ASCII
XML highly preferable