| Zebeyana |
One option is not to allow cross-class skills at 1st level.
While it may standardize skill choice for 1st-level characters, it will prevent the 1st level rogue/wizard-to-be with all Knowledge skills maxed out to 20th level.
Another option is to include skills in class level progression, much like feats for fighters :
• say 2+Int at 1st level for everyone
• 3.5 8 pts : +1 skill at level 2 • 3 • 4 • 5 • 6 • 7
• 3.5 6 pts : +1 skill at level 2 • 4 • 6 • 8
• 3.5 4 pts : +1 skill at level 3 • 6
Or any design around these lines, worked out class by class.
Note that you may use this second option AND limit the aquisition of cross-class skills to those skills gained through "normal advancement process" (p. 20), meaning every even overall character level.
And then have some prestige classes add more skills to characters (Loremasters might be a good example : maybe instead of additionnal languages).