King Amenjar said:
Suppose I've already rolled low STR but high DEX and decided it might be good to have a small, sneaky character? Am I still obliged to try and be as a big as possible?
Since the rules (optionaly) allow you to reasign characteristics as you choose (but SIZ can only swap with INT), you can certainly choose to opt for a smaller SIZ, and I'd support the idea of allowing greater flexibility in character building than that too. I personaly feel it's important to let players who ahve a clear view of the characetr they want, to be able to achieve that, within a fair system.
However from a purely game mechanical standpoint, having a lower SIZ is only a fairly small advantage for a stealthy character. Stealth and Dodge do get a penalty based on your SIZ, but high SIZ gives you a significant advantage in both hit points and damage bonus, and also a small advantage in unarmed combat.
One way to shift this a bit would be to introduce a legendary Ability for stealthy characters, that has a maximum SIZ requirement. Something like this-
Tread of the Cat
Requirements: SIZ 11 or lower, Stealth skill at 90% or higher.
Hero Points: 10
Your slight build and soft tread make you almost undetectable. Deduct your DEX + INT from your opponent's Perception tests to detect your character. The character can also move twice as fast as other characters while using the Stealth skill.
The rules don't say it, but I'd normaly assume that characters using Stealth skill to move around do so at half nromal movement rate, so a characetr with this ability would move normaly while sneaking about.
EDIT: I've added this to
my MRQ page.