This mod makes the map scroll past the edge of the map. Useful for: planting seeds while walking; doing out-of-bounds glitches; checking for out of bounds objects. There are some known bugs: On the bus-stop map, the HUD also moves when scrolling past the edge of the map. On a day with falling leaves, the leaves disappear when scrolling past the west edge of the map. This mod can be downloaded from https://github.com/bcmpinc/StardewHack/releases.
Is there an option for turning it on and off or is it a permanent change unless you uninstall the mod?
Currently it is permanent. Someone requested to have a toggle button so it can be enabled/disabled during the game. I might try to add that someday. Do you have a preference for a default key?
In the latest release v0.3 I've added ; as a toggle button. Furthermore, in the mod's configuration file, you can now specify whether the mod is enabled upon loading the game. You can also change which button is used for toggling the mod.