Booze is not explosive. Not even in real life. As has been detailed elsewhere (I think in the suggestions forum) booze is very non-flammable. Modern beer is around 5% alcohol by volume, and historic booze would have been closer to 2% and much more of a thirst quenching drink rather than a shitfaced drunk drink. You can test this yourself my attempting to light a bottle of beer on fire (use one of those grill lighters with the flame on a stick, just in case...). Some alcohol IS flammable though, but only high proof stuff like vodka or maybe whiskey. That's why you don't make a molotov cocktail with ale. You make it with vodka.
In DF terms, booze is still not explosive, and never has been. It does catch on fire, as any flaming and thirsty dwarf will demonstrate, and the wooden barrels are flammable, but the actual booze will boil softly and enshroud your foe in a soothingly mushroom scented mist. The only possible weaponization, was when steam was hot enough to be lethal and steam cookers were common. A booze steam cooker may have been possible at that time. Either way, booze is a rather no-threatening substance.
Coincidentally, you can give booze a contact syndrome that causes hard liver failure, and spread booze over your hallway via the method I posted above. Drinking booze does not actually put you in contact with the booze, technically, there are no ingestable syndromes (yet, perhaps with curses), and you can always make dwarves immune to this particular syndrome.
Goblin Crossbowman has Dwarven Ale on his feet.
Goblin Crossbowman is suffering from Consumption.
Goblin Crossbowman is suffering critical liver necrosis.
Goblin crossbowman has been struck down!