Talking about some wizard spells in Pathfinder such as Brimstone and Amber Globes that are considered splash weapons according to their descriptions. Then, I'm wondering if they also benefit from various improvements from class features and feats such as :
Underground Chemist : a Rogue archetype with alternate class features related to alchemical weaponry, one of them allows to draw splash weapons as quickly as standard weapons instead of a full-round action and adds your character's Intelligence modifier to all damage dealt by splash weapons, and another allows to deal sneak attack damage with splash weapons on a direct hit and if used for the first attack of the round ;
Throw Anything : removes the attack roll penalty from throwing improvised weapons and gives a +1 bonus on attack rolls with splash weapons ;
Concentrated Splash : splash weapons can deal more damage on a direct hit if the player forgoes splash damage ;
Splash Weapon Mastery : reduced range penalties on attacks rolls with splash weapons, the player can add an extra square adjacent to the splash area to deal splash damage and slightly redirect a missed throw ;
Slipslinger Grenadier : splash weapons can be fired with a sling.
There are a lot of other feats affecting splash weapons, there I selected some with very specific effects. So, do splash weapons created by spells benefit from any of this ?