Occasionally, if a Mines filler level generates where there is a sufficiently large space of empty stone, a little separate walled-off area may generate disconnected from the main map, containing a few gnomes and dwarves, and some more gems and gold, possibly in a chest. This area won’t get the stairs generated in it, and should probably contain a hole so that a randomly teleporting player won’t get stuck there (other types of escape items could get picked up by the gnomes and dwarves).

In variants with some form of a randomly generated garden room - whether a special room, themed room, or random vault - gnome statues generate in them.

Gnome punting: all kicks delivered to gnomes send them flying a few squares. (This also applies if a monster kicks the hero and the hero is a gnome.)

Minetown shopkeepers should be gnomes, and the priest and Watch should be dwarves, either by creating new racial variants of those monsters or via a monster race implementation. It doesn’t make any sense that everything in the town is run by humans.

Monster generation in the Mines automatically selects a G monster on 1/6 or 1/8 of all spawns. It’s odd that the branch’s lawful bias means that dwarves tend to appear over time, but not gnomes.

Gnomes don’t have any special cases to generate with daggers, or else they’re much less likely to get daggers compared to their other possible starting weapons. And if they do start with daggers, they’re much less likely to get stacks. This is to prevent the Mines from being an easy source of dozens and dozens of daggers.

G-class monsters will pick up tools if they wander onto them. (They won’t specifically seek them out and pathfind to them though).

Gnomes generated outside the Mines generate carrying one or two random gems (possibly none, subject to current level difficulty).

Any G that generate inside the wine cellar secret area in the Gnome King’s Wine Cellar are automatically hostile regardless of the player’s race or alignment.

Gnomes spawned with a sufficiently high starting level, or else just a fixed percentage of gnome lords and a different fixed percentage of gnome kings, generate with a touchstone.

Net gnomes - wield tridents and have a sticky attack (the net), which causes subsequent attacks to hit automatically