If you kick a boulder as a giant-race hero (or while polymorphed into one), it starts rolling across the ground as if it came from a rolling boulder trap.

When you play as a giant monk, Master Kaen should also be a giant, complete with giant-sized robe, so when you defeat him you can get a usable robe as well as the quest artifact.

For giant player characters, huge chunks of meat should weigh the same as boulders (i.e. light enough to pick them up easily).

Prevent giants from accidentally moving on top of a boulder in Sokoban, which incurs a luck penalty. This is probably most easily done by only allowing them to move on top of an unpushable boulder by prefixing the move with m.

Another possibility is just to prevent giants from stepping onto boulders in Sokoban at all, giving a message “The ceiling is too low for you to step over this boulder.”

Within Sokoban, boulders weigh 6000 for giants, just like anyone else, so you can’t carry them around.

Giant players can apply grease to their bodies to squeeze through diagonal choke points.

For variants that have giants as a playable race: A giant who uses the m prefix before moving onto a boulder will step onto that boulder without pushing it, whether or not the boulder has been pushed up against a wall. (Monster giants step over boulders not against walls all the time.)

Add a boulder-throwing skill for giants. Like other skills, its skill cap is determined by your role.