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SPOILERS

After using it as a valuable resource for the prior sessions; my first post as a starting PF DM(27 sessions in) on the paizo message boards. And immediately a question I have, but firstly i'll quickly introduce the party and it's escapades.

Tonight, our party consisting of:
Elf transmuter wizard 7 named Penladir
Human paladin 7 named Giles
Half-orc archery ranger 7 named Deadric
Human rogue6/wizard1 2weapon rogue named Harget.

Until now the AP was a cakewalk, Erylium the quasit was covered in grease, knocked and held down and got beat up like a schoolkid.

The thistletop upper floors fell to efficient use of the wizard's pyrotechnics/glitterdust, and Nualia simply shouldn't had came in for work that day.
Malfeshnekor was scary, but the PC's dice were blessed; 5 rounds in and the barghest went down at the hands of a smiting paladin.

Up until now the biggest concerns for the heroes had been a hit from the Vargouille and a failed save from wizard. Working Father Zantus cured him, but the starting symptoms of the transformation rendered him bold and slightly green. In terms of damage, the ghosts in thistletop's lowest floor got in the most. Here the Rogue suffered 13 str dmg and was just 2 dmg shy of dying and ghostly fluttering around himself.

After handling the Misgivings with the paladin leading the way and laughing in the face of many of the haunts, as well as the pile of ghouls and ghasts he cleaved in two with his falchion, we now arrived at the shadow clock, and the pc's are due to meet Xanesha this evening.

But my question regards the piece in between, namely the seven's sawmill encounter.

The question:

For this part, the party decided they should do some reconnaissance. So the wizard, pally and ranger stayed behind (just short of a mile away) while the rogue approached the sawmill for infiltration. In his haversack he brought the wizard's familiar, presenting it near the mill and from that point on using it to cast the wizard's touch spells on demand. Primarily, they cast invisibility to allow for a smooth recon mission. Rogue went up, leaving the 'laborers' alone and found the door to Ironbriar's office. Waiting for one of the cultists to use the door and successfully slip past him, into the office. He watched the forlorn tending his books for a while, after which he hit the familiar (an autistic mongoose) on the nose. Apparently, this was the sign for the linked wizard to cast Greater Invisibility on the Rogue via the mongoose. Hagret then proceeded to surprise Ironbriar without turning visible and killed him gruesomely fast.
After Ironbriar screamed in agony, the cultist where alarmed and started to rush in in waves. During the fight the mongoose familiar took part to combat as normal, frequently casting shocking grasp originating 1 time from the wizard's prepared spell and the remainder through the wizard using a wand of shocking grasp.

This part got me thinking of the proper mechanics of a familiar when almost a mile out from his Wizard. To me it seemed odd that the wizard actually casting the touch spells knows exactly which spell to cast and precisely when he should cast them. Should we treat it as if it has all the touch spells of the wizard and can cast them on demand? Should the wizard roll inits too and is the spell cast on his round of initiative? Can the wizard channel a wand trough his familiar? Can the wizard even anticipate when to cast which spell being so far away and having no clear knowledge of the battlefield? For as far as i know, the link between them is just emphatic and doesn't grant perception via sight or smell.

Any response is welcome! For now I'll just focus on the Xanesha fight scheduled for tonight... They killed Ironbriar upright and did not take the time to translate his ledger, so they have no clue of the evil awaiting them!

Thanks in advance