Uh, Rogues sneak attacking with splash weapons can be done with only the PHB. I'm pretty sure this has been possible since the 3.0e PHB first came out, too...
Here's how it works. The rogue has as many of these as possible: Two weapon fighting, quick draw, rapid shot.
The rogue also has several Acid Flasks or vials of Alchemist's Fire
The Wizard or Sorcerer has as many of these as possible: Grease, Glitterdust, Blindness/Deafness.
The Wizard or Sorcerer Greases or blinds the enemies with Glitterdust or whatever.
The rogue then full attacks, drawing and throwing lots of vials of Alchemist's Fire or Acid or whatever, and uses two weapon fighting / quickdraw / rapid shot to sneak attack enemies standing on the Grease (or Blinded enemies) with, dealing lots of acid or fire damage. These attacks are resolved as Touch Attacks as well. Since the enemy is balancing/blinded/whatever, they are Denied their Dex (the whole reason you are getting Sneak Attack in the first place), so their AC is going to be very very low, so you can afford to take rapid shot / two weapon fighting / range increment penalties.
This is actually probably the only way a PHB only Rogue can get their damage numbers up as high as later, splatbook using rogues...
So yes. PHB only, Rogues get full-attack sneak attacks against monsters, groups of monsters, within 30'. This is a ranged capability that rogues in a phb-only group can do, which pathfinder intentionally removed... apparently cause a designer named Jason hates competent rogues, or rogues getting full sneak attack damage with full attack actions outside of a flank...
Here's how it works. The rogue has as many of these as possible: Two weapon fighting, quick draw, rapid shot.
The rogue also has several Acid Flasks or vials of Alchemist's Fire
The Wizard or Sorcerer has as many of these as possible: Grease, Glitterdust, Blindness/Deafness.
The Wizard or Sorcerer Greases or blinds the enemies with Glitterdust or whatever.
The rogue then full attacks, drawing and throwing lots of vials of Alchemist's Fire or Acid or whatever, and uses two weapon fighting / quickdraw / rapid shot to sneak attack enemies standing on the Grease (or Blinded enemies) with, dealing lots of acid or fire damage. These attacks are resolved as Touch Attacks as well. Since the enemy is balancing/blinded/whatever, they are Denied their Dex (the whole reason you are getting Sneak Attack in the first place), so their AC is going to be very very low, so you can afford to take rapid shot / two weapon fighting / range increment penalties.
This is actually probably the only way a PHB only Rogue can get their damage numbers up as high as later, splatbook using rogues...
So yes. PHB only, Rogues get full-attack sneak attacks against monsters, groups of monsters, within 30'. This is a ranged capability that rogues in a phb-only group can do, which pathfinder intentionally removed... apparently cause a designer named Jason hates competent rogues, or rogues getting full sneak attack damage with full attack actions outside of a flank...