While reading the Expert topics, I noticed that a lot of comments were made on saves, so I looked the rules up.
According to the rules, a Warrior 2/Adept 8 has a base reflex save of 0! (Start as warrior - you don't get +1 until 3rd, switch to adept. you don't add anything until you hit +3 on a save, which is 9th level for poor saves).
OK- I can see and agree with an Adept 1/Expert 1 have +2 in all saves being bad (having seen some sick saves in D&D because of that). But 0 at 10th level seems a little harsh.
Here is my solution, comments would be greatly appreciated:
Don't change poor saves (+1/3 full levels);
Good saves are now +1/2 full levels, starting at 0 (same progression, just starting lower- 0 to 10) AND
At 1st level, give a +2 bonus to the character's good save(s).
Net effect, a single role character won't see any change. A character with only 1 or 2 levels in a side role (Warrior X/Adept 1, for example) will also be the same, but after that, your poor save(s) will be better.
Another idea I had (that I discarded as too complicated and a bit too powerful) was keeping the fractional save bonuses and adding them together to determine total base saves.