I'm playing a wizard/monk, and the central idea of this guy is that he carries no weapons, and most of his spells are non-direct damage oriented (he's a specialist conjurer, uses a lot of summon spells and creative uses of unseen servant, that sort of thing).
I was thinking of crafting an enchanted rope which is sort of a combination of the rope of climbing and rope of entanglement. So my actual question is this: if I fling out my rope and entangle someone, could I then cast a touch spell through the rope at a target 20 or so feet away?
Currently I use a monkey familiar for this sort of thing, but in-character I think this fits better.
By default a touch spell must be delivered directly by you, and not through something you are touching/holding.
Several classes/feats can get around this in limited fashion. e.g, having your familiar deliver the spell. Magus using spell strike to deliver it through a weapon.
I'm not aware of anything that would let you deliver it through a non-weapon magical item such as what you are looking for.
At GM discretion, a magus might use the rope as an improvised weapon and deliver a spell that way, but only when striking with the rope--it wouldn't work if the rope is already entangling someone as it is no longer suitable as a weapon. A wizard is basically out of luck on this without custom stuff.
Since you're crafting a custom magic item anyway, you could ask your GM to let you add in this property---but expect it to be wicked expensive if allowed.
Sounds like it's time to research a new Equipment Trick.
There are several ways to get a familiar that is constructed somehow. For example: Poppet Familiar.
Maybe if you make the rope an animated object, and then use a special familiar feat, you could then allow it to deliver touch spells for you.
/cevah