It's not hard-coded, they're all in there. You can find the examine mode cursor-moving keys in the targeting domain (since it's used for both targeting and examination), thus CMD_BS_TARGETING_SHIFT_N and so on. You can see there are already vi-keys assigned there, but you're switching to a different layout so yeah you can adjust those.
Note: CMD_BS_DEFAULT_MAPJUMP_N is actually for shifting the map view (like recentering it to see a different area), not movement. Movement is CMD_BS_DEFAULT_MOVE_N etc.