Saving Player stats for particular map, whats the best way?

I know they have a lot of saving systems that make you have to put in a code and what not to recal stuff, but could you use another way, like storing in game cache, to save a player's stats?

Single-player: yes
BNet: no

If that's the case; is there a namespoofer-proof system that works then?

No, it is logically impossible and nonsensical.

Well then what's the next best thing; i kinda wanted to have a tracking system to simple monitor the amount of "points" a player would have accumulated to allow them to unlock special featuires in the map.