I use a variant on Craft, Knowledge, and Perform which was posted here fairly long ago. I can't find the thread or the writer of this post again, but I do have a copy of the post saved in a Yahoo! group, so here you go, the section of the post relevant to the current discussion. Using this system, I would make Knowledge (Region [Local]) simply be a separate subskill for each region. And I'd recommend cascade skills for everyone; it's THE most asked for house rule in my games now.
Okay, now to the Perform skill fix... Slightly klunky, but with applications
elsewhere, and (IMHO) it makes things better all around, and 3.5e characters
less idiotic.
1) Perform is now a "Cascade Skill". This means that, each time a Rank of
Perform is purchased, a number of Skill Points equal to the Ranks of Perform
is added to the previous total... (Huh?)
It goes like this: A first-level Bard with the maximum four Skill Ranks in
Perform has 10 Skill Points in Perform to spend (1+2+3+4=10).
2) Each Perform Cascade Skill Point MUST BE SPENT ON A SPECIFIC SUBSKILL.
The first level Bard, for instance, could take Perform Sing (4), Harp (4),
Flute (2). At the next level, if they put one more Skill Point into Perform
(keeping it maxed out), then they would have five Ranks of Perform, and gain
an additional FIVE Cascade Skill Points. They could then add one more (each)
to Sing and Harp, and put the other three into Flute (thus having all three
at their Max. Skill Rank of five), or all three into Poetry (having Sing
(5), Harp (5), Flute (2), Poetry (3)).
3) No Synergy Bonuses. If you want to play an instrument, buy that
instrument. You'll have enough points!
4) The more skilled you get, the easier it is to pick up another instrument,
but the more you have, the less skilled you'll be with each.
5) You can still "waste" a few Ranks on Dance, Mime, etc., if you wish. You
can't use them for Bardic Music, but so what? You can now afford it.
6) I leave the ajudication of Perform (Comedy, et al) to the GM... It
doesn't fit my definition of "Bardic Music", but then again, neither does
Perform (Oratory) or Perform (Drums). Handle it as you see fit.
7) In all cases, Cascade Sub-skill Ranks are always limited by Max. Skill
Ranks, like any other skill.
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Other Cascade Skills:
I believe that all of the skills with sub-skills should be handled the same
way (YMMV). Namely, Craft, Knowledge, and Profession.
I think it hurts the game very little to have characters being able to get
jobs in various Professions, capable of fixing various things, and
knowledgeable in many areas (particularly when MOST PCs are hampered by MOST
Knowledge skills being Cross-Class for them).
IMHO, PCs who adventure on the Astral Plane should be able to afford some
Knowledge (Planes) when they get back. Fighters should have Knowledge
(History) to cover the ancient battles and tactics they're always talking
about...
With cascade skills, even if Knowledge or a Profession is Cross-Class, a PC
can, in a few levels, max out Skill Ranks in ONE sub-skill, or quickly pick
up a smattering in a few!
Carft/Knowledge/Perform/Profession
Cascade Skill Ranks Skill Points
1 1
2 3
3 6
4 10
5 15
6 21
7 28
8 36
9 45
10 55