Q6: Where in the d20srd are the partial BAB and saving throw rules listed?
I didn't think it was mapped out in SRD at all, it's just a different way to play the numbers presented. I get annoyed when it's presented as a variant rule because it's actually just writing out the math for the rules as they've aways been.
If you want to see it mapped out, it's on page 73 of Unearthed Arcana.
Generally it gives multi-classers better BAB. Nothing changes for single-classed characters because the rules were presented with them in mind (despite being written with fractional bonuses)
The main problem is that you still get the 2.5 when you jump into a new class at level 1. This lets the very act of multiclassing be a way to achieve absurd saves. In my opinion this isn't fair or reasonable at all, so we play it this way (The following IS houserule):
Fractional bonuses
You can gain the 2.5 for each save only once. So say a lvl 1 cleric cross-classes into rogue for his her 2nd lvl (Making her a cleric 1 rogue 1). Her fort and reflex are now all the same (2 1/5 + 1/3). If on her 3rd level she goes monk she will not gain 2.5 to all saves because she already gained her 2.5 in all saves. She instead gains .5 in all saves and has 3 1/3 as her base saves in all saves.
Max base save at lvl 20 = 12
Worst possible base save at lvl 20 = 6 2/3
The problem with doing it this way is that's significantly more complicated and kind of a pain in the ass math-wise. However so far our group deems that a worthwhile sacrifice for keeping multi-classers (like me) at a relatively close BAB and Base Save to single classers (Got a couple stubborn purists in our group)
