Self-explanatory; private servers could tweak the stats of:
Mech health, fuel, fuel regen, walk/boost/air speed, heat, dodge cooldown, turn rate, and ability length/cooldown/strength.
Weapon damage, reload time, heat generation, projectile speed, and AOE.
Item number, damage, duration, and AOE.
Upon entering a server with tweaked stats, you would receive a short notice, saying something along the lines of:
"This server has been tweaked, and may differ from standard online play. See Mech and Weapon info to see what has been changed"
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Hawken has a dedicated fanbase/community, so it should be beneficial to all to empower it so that it can produce value for the players of Hawken, whether it be balance testing, misc. other experiments, or custom experiences that players prefer.