This is actually untrue.Yes, it's called Two weapon fighting, which would lower your penalties by 2 in each hand, landing you with a +0/-2 instead of the -2/-4
The Two weapon fighting feat works like this-
Without the feat, your main hand has a -6 to attack rolls, and your off hand has a -10.
With a light weapon in your off hand or a double weapon, it's -4/-8.
If you are using two light weapons or a light weapon and one handed weapon or a double weapon AND have the two weapon fighting feat, it's -2/-2.
If you are using two one handed weapons AND have two weapon fighting, it is -4/-4
Though it's not a straight damage modifier. You use weapons of Small size, indicated by an (S) in the weapon section.Size only affects the damage (less) and +1 to attack rolls
There's a formula for basic magic item creation. A bonus to an ability score is Bonus Squared x 1000.I don't think Siberys would mind you buying a periapt of wisdom, but i believe off the top of my head they only come in +2/+4/+6 etc versions, and the lowest price is 4000 gold, you would be better off distributing your stats slightly different to accomplish the same goal.
+1 x 1 x 1000 = 1000, so a +1 periapt of wisdom is 1000 gold.
If it can be created using [url="http://www.d20srd.org/srd/magicItems/creatingMagicItems.htm"]those formulas[/url], then I have no issue with a player making a custom item. If it's a complicated formula, just be sure to post exactly how you calculated it along with the item itself.
Re: Multiclassing-Simple answer: rogue level, rogue skills, all others cross class
ranger levels, ranger skills, all others cross class.
Skills
If a skill is a class skill for any of a multiclass character’s classes, then character level determines a skill’s maximum rank. (The maximum rank for a class skill is 3 + character level.)
If a skill is not a class skill for any of a multiclass character’s classes, the maximum rank for that skill is one-half the maximum for a class skill.
Any, not all. Any semantically means that both the rogue and the ranger set of skills are now class skills for whenever he takes either, or even a prestige class. i.e. Use Magic Device, normally only a rogue skill, is now permanently HIS skill even if he takes more ranger levels.