[MicaOlaAdams]

Hi Tom,

you can adjust tap behaviour in KOReaders koreader/defaults.lua file.

-- customizable tap zones(rectangles)
-- x: x coordinate of top left corner in proportion of screen width
-- y: y coordinate of top left corner in proportion of screen height
-- w: width of tap zone in proportion of screen width
-- h: height of tap zone in proportion of screen height
DTAP_ZONE_MENU = {x = 1/8, y = 0, w = 3/4, h = 1/4}
DTAP_ZONE_CONFIG = {x = 0, y = 0, w = 0, h = 0}
DTAP_ZONE_MINIBAR = {x = 0, y = 15/16, w = 1, h = 1/16}
DTAP_ZONE_FORWARD = {x = 1/4, y = 0, w = 3/4, h = 1}
DTAP_ZONE_BACKWARD = {x = 0, y = 0, w = 1/4, h = 1}
DTAP_ZONE_BOOKMARK = {x = 7/8, y = 0, w = 1/8, h = 1/8}
DTAP_ZONE_FLIPPING = {x = 0, y = 0, w = 1/8, h = 1/8}
DDOUBLE_TAP_ZONE_NEXT_CHAPTER = {x = 6/8, y = 0, w = 2/8, h = 2/8}
DDOUBLE_TAP_ZONE_PREV_CHAPTER = {x = 0, y = 0, w = 2/8, h = 2/8}

Changing

DTAP_ZONE_FORWARD = {x = 1/4, y = 0, w = 3/4, h = 1}
DTAP_ZONE_BACKWARD = {x = 0, y = 0, w = 1/4, h = 1}

to

DTAP_ZONE_FORWARD = {x = 1/4, y = 0, w = 3/4, h = 3/4}
DTAP_ZONE_BACKWARD = {x = 1/4, y = 3/4, w = 3/4, h = 1/4}

should do the trick.

If you want those settings to stay persistent between updates put those lines of code to koreader/defaults.persistent.lua instead.