There is a working patch to bring dead zones to the fuze+ touchpad driver.
http://gerrit.rockbox.org/r/#/c/677/It actually does increase the accuracy of button presses notably, for me at least. With luck, it will be merged soon. As soon as I include deadzone settings for the touchscreen buttons, and pamaury rewrites it all
But this shouldn't stop you from moving forward with a plugin, any new plugin should be written ambiguously enough to work on a wide range of players. As far as Cookie Clicker goes is there source code available somewhere? Preferably in C.
For any mods reading, this thread should be moved to "Feature Ideas"