Ok, if a large or larger creature gets a splash weapon thrown at him, because he technically also takes up squares in the splash zone, does he take the 1 point of splash damage? I'm not sure and trying to make sure there is no misconception on rules.
Celebrim and Borthos, fireballs do not cost you gold for every hit. Acid flask cost you 10 gp every attempted attack and Alchemist fire costs 20 gp. The extra splash damage is only 1 hp per square or 2 per square if you want to spend a feat. It's not that much and if a player abuses it they will not have the gp for other permanent magic items that can be more abusive to a game.
Or if splash damage just applies once to a large or bigger creature? 1d6+9 (+4 int, +1 splash, +4 int added to splash). not that bad at level 4 is it?
especially when I can throw 2 with TWF at 4th, 3 at 5th (rapid shot and TWF) and deal 3d6+30 (assuming my intelligence goes up by 2 at that point and splash damage applies only once per large creature.) fire resistance 5? oops, you only took 3d6+25.
Oh wait, I threw acid? or Liquid Ice? oops, no resistance.
However, I should note that the ruling you seem to have become happy with is probably not the intention of the rules. Though I admit that the rules could be read such that a creature directly hit by a grenade like splash weapon takes both the damage for a direct hit and the splash damage (since technically the creature is 'within 5' of the point of impact'), I do not believe that that is the intention of the rules. I believe the intention of the rules is that you take either the direct damage hit or the splash damage but not both. However, do what works for your table and I'm not that worried about this on a gamist level because it opens up area of effect damage to a greater number of classes.
Hm...I thought it worked just against the first 5 points of fire damage it takes per turn. Oh well, that's why I have other stuff.Just for the record though, resistance doesn't work like that. The resistance would be applied against each attack, so if you have to apply -5 to the direct damage AND -5 to the splash damage. So in fact, you'd only be doing 3d6 damage versus something with fire resistance 5. Still, even that's not be bad considering this is a very bad case for you (equivelent to melee attacking a target that has DR you can't overcome).
I would not apply any bonus damage, like the INT bonus or the +1 for the Grenadier feat, to a second round of damage that Alchemist fire gets. You get the extra damage by knowing how to make it burn hotter or hitting the right spot, but it runs low on fuel to burn or it spreads in an uncontrollable manner in the second round.Not at all, especially with you getting double damage to swarms and especially since it gives continuous damage over time.
Just for the record though, resistance doesn't work like that. The resistance would be applied against each attack, so if you have to apply -5 to the direct damage AND -5 to the splash damage. So in fact, you'd only be doing 3d6 damage versus something with fire resistance 5. Still, even that's not be bad considering this is a very bad case for you (equivelent to melee attacking a target that has DR you can't overcome).
Here is why I argue this way. To quote the SDR:This is a gamist explanation for changing the rules. That's going to be more convincing at some tables than others.
But, at least as I'm reading the rules, that's not how they are intended to work and speaking as a programmer that's used to reading literally rather than by intent I can find no reading that gets them to work that way. The only literal reading of the rules that gets you close to that I can see is that a target hit directly by a grenade like weapon always takes both the direct damage and the splash damage, but there is nothing in the text that makes size matter in that interpretation or causes splash damage to stack.
While I'm about the last person to tell you to respect the rules just because, I'm not convinced by your reasoning. Still, you are right, it's not going to be unbalancing if you change the rule as you suggest.