Why in the nine hells wouldn't you?
Since you don't seem capable of reading the exchange due to some kind of disability, I'll summarize. People were discussing not multi-classing anyone during the entire game and I said you pretty much have to muilti-class Octavia or ignore her. Then someone said she's still good as a straight Wizard, even with losing a level to rogue. Then I said I just thought she'd always be behind a wizard PC, but I guess you could still do it, so fair enough. Then you charged in a couple pages later saying BUT ARKANE TRICKSTER like a dipshit.
Because I absolutely detest mentions that Octavia is in any way worse then a pure wizard, when in fact she's a straight upgrade.
Her specialization bonus become irrelevant though which at 20 would be +5 to two attributes of her choosing. She loses effectively 5 feats. 3 bonus feats from wizard progression and the need to go for PBS and Precise Shot since AT wants and needs ranged touch attacks. You probably want weapon focus for rays as well. That does not leave much for good feats like Toughness, II, Spell Focus and Greater Spell Focus and spell penetration.
Isn't her specialization bonus irrelevant by default? It's a very small enhancement bonus, so it's always going to get trumped by magic items: +2 at level 5 can be useful to use your items for other characters, but by level 10 a +3 is laughable, since you are swimming in +4 items (or more). A +4 by level 15 is a joke (and not even a funny one).
I wouldn't say that Point-Blank Shot and Precise Shot are "wasted" feats. I take them on almost all my ranged arcane spellcaster and usually I have enough room to take all the Spell Focus I want.
The bonus puts her from 17 to 18 dex at start which makes a small but noticable difference in terms of to hit, initiative and skill usage. What falls off is TK fist but it is still a decent spell early on.
Later you can put those +5 to for example charisma and willpower. In essence it allows you to gear for something different for that attribute.At worst you go +5 strength and +5 wisdom just for will save bonus and carry capacity. This is nothing to sneeze at. At 20 you can justify putting that last point into wisdom and get effectively +3 will saves and +3 to perception.
PBS and PS are wasted on a pure wizard. There are so many alternatives to touch spell attacks that you really do not have to bother. Furthermore you can use a wand of True Strike in case you really need to get one off on those rare occasions. AT essentially specializes in ranged touch attack spells since those are the only spells which apply SA until you get level 10 AT which does not happen until level 14. Ergo PBS and PS are vital on an AT and weapon focus ray is a solid though not necessarily needed option.
No, you can't. The bonus applies only to physical abilities. The game throws belts of physical flow/perfection at you, so the only real possible benefit of that class feature is to increase your carrying capacity... and that really isn't worth it, is it? I guess you can also sustain more Strength damage, but why would you put Octavia in melee range with mandragora swarms or ghosts?
You say that PBS and PS are wasted feats, but your suggestion of a good feat for Octavia is what? Toughness? I mean HP are nice, sure, but how many times in the entire game is your back line Wizard going to get targeted by the enemies? Three? Four? Also, I love taking Spell Focus, but it's a +1, nothing more. Are you really going to notice a +1 THAT much?
How is Weapon Focus a "solid" option? It's a +1 to hit, it's garbage. If I'm not planning on taking Dazzling Display, I'm not even considering taking Weapon Focus.
