[i3] Why not use F keys?

i3/.config/i3/config

@@ -261,6 +261,8 @@ set $casts ~/videos/casts
 bindsym XF86MonBrightnessUp exec ~/.config/i3/bright.sh -u # increase screen brightness
 bindsym XF86MonBrightnessDown exec ~/.config/i3/bright.sh -d # decrease screen brightness
 bindsym XF86Search exec ~/.config/i3/bright.sh 1 # decrease screen brightness
+bindsym F5 exec ~/.config/i3/bright.sh -d # decrease screen brightness
+bindsym F6 exec ~/.config/i3/bright.sh -u # increase screen brightness
 
 # ROFI
 bindsym $mod+space   exec rofi -show combi -display-window "W"
@@ -269,14 +271,14 @@ bindsym $mod+Shift+p exec --no-startup-id ~/.config/rofi/rofi-otp.sh
 bindsym $mod+o       exec --no-startup-id ~/.config/rofi/www.sh
 bindsym $mod+Shift+o exec --no-startup-id ~/.config/rofi/www-incognito.sh
 bindsym $mod+s       exec --no-startup-id ~/.config/rofi/web-search.sh
-bindsym $mod+Shift+b exec --no-startup-id ~/.config/rofi/books-search.sh
+bindsym $mod+b exec --no-startup-id ~/.config/rofi/books-search.sh
 bindsym $mod+Shift+s exec --no-startup-id ~/.config/rofi/slack.sh
 
 # Lock with 
 bindsym $mod+Shift+F12 exec --no-startup-id i3lock -i ~/var/media/backgrounds/astrobin/`ls -Ar ~/var/media/backgrounds/astrobin/ | tail -n 1` -t
 
 # BACKGROUND
-exec hsetroot -cover ~/var/media/backgrounds/bing/`ls -A ~/var/media/backgrounds/bing | tail -n 1`
+#exec hsetroot -cover ~/var/media/backgrounds/bing/`ls -A ~/var/media/backgrounds/bing | tail -n 1`
 
 ##### APP BINDS ###################################
 
@@ -288,15 +290,15 @@ bindsym $mod+Shift+y exec xfreerdp /u:powellc /p:mainroot /v:telesto.local /w:12
 bindsym $mod+Ctrl+y exec pkill xfreerdp
 
 bindsym Print exec --no-startup-id flameshot gui
-bindsym $mod+F5 exec --no-startup-id $browser https://15five.15five.com/report/current/
+bindsym $mod+F5 exec --no-startup-id $browser https://
 bindsym $mod+F6 exec --no-startup-id $solobrowser https://www.quip.com
-bindsym $mod+F7 exec --no-startup-id $solobrowser https://15five-dev.atlassian.net/secure/Dashboard.jspa
-bindsym $mod+F8 exec --no-startup-id $browser https://green.five.unbl.ink
+bindsym F7 exec --no-startup-id $solobrowser https://15five-dev.atlassian.net/secure/Dashboard.jspa
+bindsym F8 exec --no-startup-id $browser https://15five.15five.com/report/current/
 
-bindsym $mod+F9 exec --no-startup-id $browser https://green.five.unbl.ink
-bindsym $mod+F10 exec --no-startup-id $solobrowser https://green.five.unbl.ink/admin/dj
-bindsym $mod+F11 exec --no-startup-id $solobrowser https://podcasts.unbl.ink/player
-bindsym $mod+F12 exec --no-startup-id $solobrowser https://wx.unbl.ink
+bindsym F9 exec --no-startup-id $browser https://green.five.unbl.ink
+bindsym F10 exec --no-startup-id $solobrowser https://green.five.unbl.ink/admin/dj
+bindsym F11 exec --no-startup-id $solobrowser https://podcasts.unbl.ink/player
+bindsym F12 exec --no-startup-id $solobrowser https://wx.unbl.ink
 bindsym $mod+Insert exec --no-startup-id zathura ~/var/documents/15five/strengths.pdf
 
 bindsym $mod+e       exec emacsclient -cnq
@@ -324,12 +326,13 @@ bindsym XF86AudioRaiseVolume exec pulseaudio-ctl up
 bindsym XF86AudioLowerVolume exec pulseaudio-ctl down
 bindsym XF86AudioMute exec pulseaudio-ctl mute
 bindsym XF86AudioMicMute exec pulseaudio-ctl mute-input
-bindsym $mod+x exec pulseaudio-ctl up
-bindsym $mod+z exec pulseaudio-ctl down
+bindsym F1 exec pulseaudio-ctl mute
+bindsym F2 exec pulseaudio-ctl down
+bindsym F3 exec pulseaudio-ctl up
+bindsym F4 exec pulseaudio-ctl mute-input
 bindsym $mod+Home exec --no-startup-id cvlc https://stream.unbl.ink/mopidy
 bindsym $mod+Shift+Home exec --no-startup-idcvlc https://playerservices.streamtheworld.com/api/livestream-redirect/WMEAFM.mp3
 bindsym $mod+End exec pkill vlc
-bindsym $mod+m exec pulseaudio-ctl mute
 
 # Iapetus central volume
 #@bindsym $mod+. exec ssh iapetus.local down