yes i think 10 is the max.
i havnt been bothered to look into it, no motivation to play with the editor lately [/b]
I discovered this while looking into the game files:
<PlayerTypes Number="11">
<Type Name="Default" Value="0" />
<Type Name="Scrums" Value="1" />
<Type Name="Lineouts" Value="2" />
<Type Name="Tackler" Value="3" />
<Type Name="Runner" Value="4" />
<Type Name="Passer" Value="5" />
<Type Name="Kicker" Value="6" />
<Type Name="Crasher" Value="7" />
<Type Name="Rucks" Value="8" />
<Type Name="Goalkicker" Value="9" />
<Type Name="Playmaker" Value="10" />
</PlayerTypes>
<Skills Number="14">
<Skill Name="Command" Value="0" />
<Skill Name="Passer" Value="1" />
<Skill Name="Playmaker" Value="2" />
<Skill Name="Scoring" Value="3" />
<Skill Name="GoalKicker" Value="4" />
<Skill Name="TacticalKicking" Value="5" />
<Skill Name="CrashBall" Value="6" />
<Skill Name="TackleBreaker" Value="7" />
<Skill Name="Tackling" Value="8" />
<Skill Name="BallWinner" Value="9" />
<Skill Name="DefensiveOrganisation" Value="10" />
<Skill Name="Scrummager" Value="11" />
<Skill Name="Jumper" Value="12" />
<Skill Name="InjuryResistance" Value="13" />
</Skills>
Hope it helps