diff --git a/exec_eval_preconditions.lua b/exec_eval_preconditions.lua
index f6cf487..a1a8468 100644
--- a/exec_eval_preconditions.lua
+++ b/exec_eval_preconditions.lua
@@ -86,6 +86,12 @@ yl_speak_up.eval_precondition = function(player, n_id, p, other_options_true_or_
 	elseif(p.p_type == "auto") then
 		-- a precondition set by using the staff; kept for compatibility
 		return true
+	elseif(p.p_type == "true") then
+		-- mostly useful for generic dialogs
+		return true
+	elseif(p.p_type == "false") then
+		-- mostly useful for temporally disabling options
+		return false
 	elseif(p.p_type == "function") then
 		if(not(yl_speak_up.npc_has_priv(n_id, "precon_exec_lua", p.p_is_generic))) then
 			return false
diff --git a/fs_edit_general.lua b/fs_edit_general.lua
index 52f317e..e064939 100644
--- a/fs_edit_general.lua
+++ b/fs_edit_general.lua
@@ -755,6 +755,11 @@ yl_speak_up.save_element_p_or_a_or_e = function(
 		if(data.fulfilled  and data.fulfilled  ~= "-select-") then
 			v[ "p_fulfilled" ] = data.fulfilled
 		end
+
+	elseif(what_type == "true") then
+		v[ "p_value" ] = true -- doesn't matter here - just *some* value
+	elseif(what_type == "false") then
+		v[ "p_value" ] = true -- doesn't matter here - just *some* value
 	end
 
 	v[ "alternate_text" ] = data.alternate_text
diff --git a/fs_edit_preconditions.lua b/fs_edit_preconditions.lua
index bb207c8..ab5bf95 100644
--- a/fs_edit_preconditions.lua
+++ b/fs_edit_preconditions.lua
@@ -71,6 +71,8 @@ local check_what = {
 	"execute Lua code (requires npc_master priv)", -- 7 -> 9
 	"Call custom functions that are supposed to be overridden by the server.", -- 8 -> 10
 	"The preconditions of another dialog option are fulfilled/not fulfilled.", -- 9 -> 11
+	"nothing - always true (useful for generic dialogs)",
+	"nothing - always false (useful for temporally deactivating an option)",
 }
 
 -- how to store these as p_type in the precondition:
@@ -82,7 +84,8 @@ local values_what = {"", "state", "block", "trade",
 	-- custom function (does not require npc_master priv)
 	"custom",
 	-- depends on the preconditions of another option
-	"other"}
+	"other",
+	"true", "false"}
 
 -- options for "a trade"
 local check_trade = {
@@ -177,6 +180,10 @@ yl_speak_up.show_precondition = function(p, pname)
 		return "quest: Always false."
 	elseif(p.p_type == "auto") then
 		return "auto: Always true."
+	elseif(p.p_type == "true") then
+		return "true: Always true."
+	elseif(p.p_type == "false") then
+		return "false: Always false."
 	elseif(p.p_type == "function") then
 		return "function: evaluate "..tostring(p.p_value)
 	elseif(p.p_type == "state") then