You can set refresh rate to 0 and the timer won't even be created. Everything will update in real time with your mouseovers. Note that this disables things like marquees and updating texts, like health and mana.

diff --git a/Modules/Text.lua b/Modules/Text.lua
index 718802f..b636d7c 100644
--- a/Modules/Text.lua
+++ b/Modules/Text.lua
@@ -429,13 +429,15 @@ local update
 function mod:OnEnable()
 	StarTip:SetOptionsDisabled(options, false)
 	self:CreateLines()
-	self.timer = LibTimer:New("Text module", self.db.profile.refreshRate, true, draw, nil, self.db.profile.errorLevel, self.db.profile.durationLimit)
+	if self.db.profile.refreshRate > 0 then
+		self.timer = LibTimer:New("Text module", self.db.profile.refreshRate, true, draw, nil, self.db.profile.errorLevel, self.db.profile.durationLimit)
+	end
 	self.unitFrameFunkyTimer = LibTimer:New("Funky unit frames timer", 100, false, unitFrameFunkyFunction, nil, StarTip.db.profile.errorLevel)
 end

 function mod:OnDisable()
     StarTip:SetOptionsDisabled(options, true)
-	self.timer:Del()
+	if self.timer then self.timer:Del() end
 	self.unitFrameFunkyTimer:Del()
 end

@@ -645,7 +647,11 @@ function mod:RebuildOpts()
 			type = "input",
 			pattern = "%d",
 			get = function() return tostring(self.db.profile.refreshRate) end,
-			set = function(info, v) self.db.profile.refreshRate = tonumber(v) end,
+			set = function(info, v)
+				self.db.profile.refreshRate = tonumber(v)
+				self:OnDisable()
+				self:OnEnable()
+			end,
 			order = 6
 		},
 		defaults = {
@@ -1160,7 +1166,7 @@ function mod:SetUnit()
     end
     -- End

-	self.timer:Start()
+	if self.timer then self.timer:Start() end

 	if GetMouseFocus() ~= UIParent then
 		self.unitFrameFunkyTimer:Start()