`Select` to interact with objects (when a red exclamation mark appears).`CPad` to run, push, climb, use the Chibi-Vacuum, Chibi-Eyes, &c.Chibi-Robo: Clean Sweep! (Okaeri! Chibi-Robo! Happy Rich Oosouji!).Call of Duty: World at War (New3DS only).CPad is also used for steering a vehicle (a little bit).Requires the latest version of nds-bootstrap (v70.0 or newer). To use it, visit the page, tick some checkboxes, copy the resulting cheatcode and paste it into your game in R4CCE. For example, you can assign the CStick to the ABXY buttons to make aiming easier in some FPS games. You can also map/remap the CPad, CStick and ZL & ZR buttons. 3DS-NDS Key Remapper: Patch generator that lets you remap keys in any NDS game.
TLDR list of mods I've made a bit more lengthy description is probably somewhere below in the text, in the changelog