Taryn
First Post
If it wasn't a class skill then forget it completely.
Unfortunately, in 3.5e, if it's not a class skill, all you have to do is take a level in Bard or Expert and you get it as a class skill... permanently.
Now, as far as things go there... I use a flaws system where the character can gain multiple different advantages for his/her flaw points, one of which is turning a skill into a class skill for their character, but I digress.
This system is a step away from the ease in which the standard rules allow you to learn new languages - I've always saw learning languages as being much harder than putting 2 points of effort into the skill - usually in D&D, when you only have 1 rank in a skill, you get what you get with this system, rudimentary capability at that skill.
As far as your 1 rank language / 8 ranks diplomacy issue: I -would- put a -1 or -2 circumstance penalty on the rolls of the players IF they were trying to talk to the King in his own language. Additionally, I would put a -1 on them for not knowing the proper etiquete for such a situation. Oh, and, depending on the king, they might suffer an additional penalty if they didn't have enough ranks in Knowledge: Nobility.
Racial Prestige Classes at 12th level: Uhh... your problem here is qualifying for a racial prestige class at 12th level... as opposed to never under the old system. I think the number of ranks in the skill is set just fine.
I also give all of my characters Common: it is understood that it's the basic language that almost everybody in the world will speak, including the goblin the PCs just slaughtered mercilessly instead of talking to.