KiCad script to layout key switch matrix with LED. Copy code and run it in Scripting Console by right clicking to chose "Paste And Run".

gistfile1.txt

# starting position
sw = {}
led = {}
reg = {}
diode = {}
sw['ref'] = 'K'
sw['start_x'] = 42.4
sw['start_y'] = 30.3
sw['orientation'] = 180
sw['side'] = 0 # layer 0 = 'Front'
led['ref'] = 'E'
led['start_x'] = 42.4
led['start_y'] = 35.35
led['orientation'] = 0
led['side'] = 0 # layer 0 = 'Front'
reg['ref'] = 'R'
reg['start_x'] = 37.1
reg['start_y'] = 30.3
reg['orientation'] = 0
reg['side'] = 0 # layer 0 = 'Front'
diode['ref'] = 'D'
diode['start_x'] = 37.1
diode['start_y'] = 35.35
diode['orientation'] = 180
#diode['side'] = 31 # layer 31 = 'Back'
diode['side'] = 0 # layer 0 = 'Front'
components = [sw, led, reg, diode]
# distance between key switches
dx = 10.6
dy = 10.1

# number of rows and columns of the matrix
# in schematics, I have 3x3 matrix as subsheet. In the main sheet, I have blocks of subseets.
#rown = 6
#coln = 15
inner_rown = 3
inner_coln = 3
block_rown = 2
block_coln = 5
set_aside = [39, 42, 45, 84, 87, 90, 82, 38]
shift_half = [47, 48, 55, 56, 57, 64, 65, 66, 73, 74, 75]

import pcbnew
board = pcbnew.GetBoard()

refn = 0
for brow in range(block_rown):
    for bcol in range(block_coln):
        for inrowi in range(inner_rown):
            for incoli in range(inner_coln):
                #refn = brow*(inner_rown*inner_coln*block_coln) + inrowi*(inner_coln*block_coln) + bcol*inner_coln + incoli
                refn += 1
                for comp in components:
                    reftxt = f"{comp['ref']}{refn}"
                    fp = board.FindFootprintByReference(reftxt)
                    x = comp['start_x'] + bcol * (dx*inner_coln) + dx*incoli
                    if refn in set_aside:
                        x += dx*5
                    if refn in shift_half:
                        x += dx/2
                    y = comp['start_y'] + brow * (dy*inner_rown) + dy*inrowi
                    fp.SetPos(pcbnew.VECTOR2I_MM(x, y))
                    fp.SetOrientationDegrees(comp['orientation'])
                    if comp['side'] == 31:
                        fp.SetLayerAndFlip(31)
                        pass
                    print(f"block({brow}, {bcol}) ({inrowi},{incoli}) x:{x} y:{y} ref:{reftxt}")

pcbnew.Refresh()