Vigwyn the Unruly said:
The DMG says "In this [surprise] round, each character gets only a standard action" (page 23, emphasis mine).
I interpret that to limit the action in this round to 1 standard action and nothing else, not even a 5' step.
The Primary rule source disagrees with the Secondary source you quoted.
From PHB 3.5 (quoted from SRD)
"The Surprise Round: If some but not all of the combatants are aware of their opponents, a surprise round happens before regular rounds begin. Any combatants aware of the opponents can act in the surprise round, so they roll for initiative. In initiative order (highest to lowest), combatants who started the battle aware of their opponents each take a standard action during the surprise round.
You can also take free actions during the surprise round. If no one or everyone is surprised, no surprise round occurs."
From DMG 3.5 Errata
"Errata Rule: Primary Sources
When you find a disagreement between two D&D rules
sources, unless an official errata file says otherwise, the
primary source is correct. One example of a
primary/secondary source is text taking precedence over a
table entry. An individual spell description takes precedence
when the short description in the beginning of the spells
chapter disagrees.
Another example of primary vs. secondary sources involves
book and topic precedence.
The Player’s Handbook, for
example, gives all the rules for playing the game, for PC
races, and the base class descriptions. If you find something
on one of those topics from the Dungeon Master’s Guide or
the Monster Manual that disagrees with the Player’s
Handbook, you should assume the Player’s Handbook is the
primary source. The Dungeon Master’s Guide is the primary
source for topics such as magic item descriptions, special
material construction rules, and so on. The Monster Manual
is the primary source for monster descriptions, templates, and
supernatural, extraordinary, and spell-like abilities."