THE fix

code/modules/client/preferences.dm

@@ -51,6 +51,7 @@ GLOBAL_LIST_EMPTY(preferences_datums)
 	var/ooccolor = "#c43b23"
 	var/aooccolor = "#ce254f"
 	var/enable_tips = TRUE
+	var/itemoutline_pref = TRUE
 	var/tip_delay = 500 //tip delay in milliseconds
 
 	//Antag preferences

code/modules/client/preferences_savefile.dm

@@ -416,6 +416,7 @@ SAVEFILE UPDATING/VERSIONING - 'Simplified', or rather, more coder-friendly ~Car
 	S["hud_toggle_color"]	>> hud_toggle_color
 	S["menuoptions"]		>> menuoptions
 	S["enable_tips"]		>> enable_tips
+	S["itemoutline_pref"]		>> itemoutline_pref
 	S["tip_delay"]			>> tip_delay
 	S["pda_style"]			>> pda_style
 	S["pda_color"]			>> pda_color
@@ -591,6 +592,7 @@ SAVEFILE UPDATING/VERSIONING - 'Simplified', or rather, more coder-friendly ~Car
 	WRITE_FILE(S["hud_toggle_color"], hud_toggle_color)
 	WRITE_FILE(S["menuoptions"], menuoptions)
 	WRITE_FILE(S["enable_tips"], enable_tips)
+	WRITE_FILE(S["itemoutline_pref"], itemoutline_pref)
 	WRITE_FILE(S["tip_delay"], tip_delay)
 	WRITE_FILE(S["pda_style"], pda_style)
 	WRITE_FILE(S["pda_color"], pda_color)

code/modules/client/verbs/etips.dm

@@ -18,3 +18,12 @@
 		prefs.tip_delay = max(indelay, 0.01)
 		prefs.save_preferences()
 		to_chat(usr, "<span class='danger'>Tooltip delay set to [indelay] milliseconds.</span>")
+
+/client/verb/toggle_hover_outline()
+	set name = "Toggle hover outline"
+	set desc = "Toggles hover-over item outline"
+	set category = "Preferences"
+
+	prefs.itemoutline_pref = !prefs.itemoutline_pref
+	prefs.save_preferences()
+	to_chat(usr, "<span class='danger'>Item outline [prefs.itemoutline_pref ? "en" : "dis"]abled.</span>")