map modifier to mouse button click

[planet36]

I want to map a momentary press of the Shift key to a mouse left click (or double click).

Is this possible with xcape?

In /usr/include/X11/keysymdef.h I found these definitions:

#define XK_Pointer_Button_Dflt           0xfee8
#define XK_Pointer_Button1               0xfee9
#define XK_Pointer_DblClick_Dflt         0xfeee
#define XK_Pointer_DblClick1             0xfeef

Trying to use any of those results in an error.

$ xcape -d -t 500 -e 'Shift_L=Pointer_Button_Dflt'

Assigned mapping from "Shift_L" ( keysym 0xffe1, key code 50)
WARNING: No keycode found for keysym Pointer_Button_Dflt (0xfee8) in mapping Shift_L. Ignoring this mapping.
Failed to parse_mapping

$ xcape -d -t 500 -e 'Shift_L=Pointer_Button1'

Assigned mapping from "Shift_L" ( keysym 0xffe1, key code 50)
WARNING: No keycode found for keysym Pointer_Button1 (0xfee9) in mapping Shift_L. Ignoring this mapping.
Failed to parse_mapping

$ xcape -d -t 500 -e 'Shift_L=Pointer_DblClick_Dflt'

Assigned mapping from "Shift_L" ( keysym 0xffe1, key code 50)
WARNING: No keycode found for keysym Pointer_DblClick_Dflt (0xfeee) in mapping Shift_L. Ignoring this mapping.
Failed to parse_mapping

$ xcape -d -t 500 -e 'Shift_L=Pointer_DblClick1'

Assigned mapping from "Shift_L" ( keysym 0xffe1, key code 50)
WARNING: No keycode found for keysym Pointer_DblClick1 (0xfeef) in mapping Shift_L. Ignoring this mapping.
Failed to parse_mapping

[planet36]

I found a solution using xmodmap, xcape, sxhkd, and xte.

(in .xinitrc)

# Look for unused KeyCodes
#xmodmap -pk

# Map F13 to an unused KeyCode
xmodmap -e 'keycode 253 = F13'

xcape -e 'Shift_L=F13'

(in .config/sxhkd/sxhkdrc)

@F13
	xte 'mouseclick 1' 'mouseclick 1'