Racial Favored Classes and Half-elves.

[Eretas]

As Herolab did not allow a Half-elf mage to use the alternative racial favored class for elves,

Wizard: Select one arcane school power at 1st level that is normally usable a number of times per day equal to 3 + the wizard's Intelligence modifier. The wizard adds +1/2 to the number of uses per day of that arcane school power.

I wonder if it's a bug in HeroLab or is it because those "Racial favored option" are not include in the Elf Blood - Half-Elf Racial Traits

Elf Blood: Half-elves count as both elves and humans for any effect related to race.

Racial Favored Classes
The final section for each racial discussion describes alternative benefits for members of that race taking certain classes as a favored class. The normal benefit of having a favored class is simple and effective: your character gains one extra hit point or one extra skill rank each time she gains a level in that class (or in either of two classes, if she is a half-elf). The alternate favored class abilities listed here may not have as broad an appeal as the standard choices. They are designed to reflect flavorful options that might be less useful in general but prove handy in the right situations or for a character with the right focus. Most of them play off racial archetypes, like a half-orc's toughness and proclivity for breaking things or elven grace and finesse.

In most cases, these benefits are gained on a level-by-level basis—your character gains the specified incremental benefit each time she gains a level. Unless otherwise noted, these benefits always stack with themselves. For example, a human with paladin as a favored class may choose to gain 1 point of energy resistance each time she gains a level; choosing this benefit twice increases this resistance bonus to 2, 10 times raises it to 10, and so on.

In some cases this benefit may eventually hit a fixed numerical limit, after which selecting that favored class benefit has no effect. Of course, you can still select the bonus hit point or skill rank as your favored class benefit, so there is always a reward for sticking with a favored class.

Finally, some of these alternate favored class benefits only add +1/2, +1/3, +1/4, or +1/6 to a roll (rather than +1) each time the benefit is selected; when applying this result to the die roll, round down (minimum 0). For example, a dwarf with rogue as his favored class adds +1/2 to his trap sense ability regarding stone traps each time he selects the alternate rogue favored class benefit; though this means the net effect is +0 after selecting it once (because +1/2 rounds down to +0), after 20 levels this benefit gives the dwarf a +10 bonus to his trap sense (in addition to the base value from being a 20th-level rogue).

As in the previous section, what is presented here is a set of alternative benefits that characters of each race may choose instead of the normal benefits for their favored class. Thus, rather than taking an extra hit point or an extra skill rank, players may choose for their characters to gain the benefit listed here. This is not a permanent or irrevocable choice; just as characters could alternate between taking skill ranks and hit points when they gain levels in their favored class, these benefits provide a third option, and characters may freely alternate between them.

As with any alternate or optional rule, consult with your GM to determine whether exchanging normal favored class benefits for those in this chapter will be allowed.

[Eretas]

And the answer is no...
Just found the FAQ

http://paizo.com/paizo/faq/v5748nruor1fn#v5748eaic9n86
Half-Elf or Half-Orc: Can a character of either of these races select human racial favored class options?
No. While half-elves and half-orcs do count as humans "for any effect related to race", racial favored class options do not count as an "effect."

—Jason Bulmahn, 08/13/10

[lev36]

...will Hero Lab be updated to allow half-elves to choose Human favored-class bonuses?

http://paizo.com/paizo/faq/v5748nruor1fn#v5748eaic9r7c

[Mathias]

It is a bug that we do not currently handle these. PLEASE report bugs using the link in the stickied thread named "Please report pathfinder bugs using the link in this thread".

This one's already been reported, and is already on our to-do list.