Strongarm Bracers (MiC 139) allow the wearer to "...wield weapons as if you were one size category larger than normal . (You don't take any penalty when using weapons as normal for your size.)"

Steadfast Boots (MiC 138) allow the wearer to treat a two-handed weapon they wield as if they had readied that weapon against any creature that charges them, even if the weapon can't normally be set against a charge.

A longsword is a one-handed weapon. One-handed weapons do not qualify for the aforementioned ability of Steadfast Boots.

Weapons larger than the wielder's size category are treated as one step higher. (PHB 113) Thus, when wielded by a medium creature, a large longsword would be considered Two-Handed. So therefore, a Large Longsword wielded by a medium creature would be treated as a two-handed weapon for the purposes of the aforementioned ability of Steadfast Boots, and thus qualify.

Q679

If a medium creature wielding a large longsword is wearing Strongarm Bracers, would he still qualify for the aforementioned ability of Steadfast Boots? I.e. Do the Strongarm Bracers only remove the penalty, or also the Two-Handedness?

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(Repost of unanswered questions)
Q651

What, if any, are the limitations on mitigating the Spellcraft DC's of epic spells? E.g., could a character make an epic spell with a Spellcraft DC of 1? (thus minimizing research costs to only 9000g, 360xp, and one day)

Q 653

Regarding the epic Seed: Transform, the SRD says:

For each normal extraordinary ability or supernatural ability granted to the transformed creature, increase the Spellcraft DC by +10.
Is it required to grant every extraordinary ability and supernatural ability of the new form, and thus increase the Spellcraft DC, or is this done at the option of the creator of the spell?

Q 653a

For instance, the spell creator is using the epic Seed: Transform to create a spell which changes him into a Solar. He already has Darkvision in his natural form. Does he need to include Darkvision in the spell creation (and thus increase the DC) since it is an ability of the assumed form, or does he have the option to leave it off?