I've been thinking a long while about "what if SE gave us the chance to merit 2hrs?" and made some systems / upgrades that would be pretty nice, but not too game-breaking. Who doesnt want their 2hr beefed up? and most of them arent worth the 2 hours it takes just to use it again. I think a Group3 category for each job with a 4-5 merit cap would work, if SE tried to let you specialize your 2hr in some way. Here are a few ideas that might work for each job (leaving out ToAU jobs and DRG lol)
Mighty Strikes
-Merit: Grants an Accuracy bonus while Mighty Strikes is active.
+1 Merit raises Accuracy bonus by 5.
Hundred Fists
-Merit: Adds a chance to critical hit to your attacks during Hundred Fists.
+1 merit raises Critical Hit rate by 5%.
Chainspell
-Merit: Adds a reduction in spell cost for the duration of Chainspell.
+1 merit raises reduction by -5%.
Benediction
-Merit: Adds a Refresh effect after Benediction.
+1 merit raises Refresh effect by +1.
Manafont
-Merit: Increases all spell potency during Manafont.
+1 merit increases spell potency by +5%.
Perfect Dodge <- lol
-Merit: Decreases attack delay during Perfect Dodge.
+1 merit increases effect by -10%.
Invincible
-Merit: Decreases Enmity loss during Invincible.
+1 merit increases the effect by 5%.
Blood Weapon
-Merit: Grants an attack bonus during Blood Weapon.
+1 merit increases attack bonus by +5%.
Eagle Eye Shot
-Merit: Grants the chance to fire a second shot with EES, increasing damage by 2x.
+1 merit increases chance by +10%.
Mijin Gakure <- lol
-Merit: Increases damage dealt by Mijin Gakure.
+1 merit increases damage by +5%.
Meikyo Shisu
-Merit: Grants an attack bonus during Meikyo Shisu.
+1 merit increases attack bonus by +10%.
Astral Flow
-Merit: Increases damage dealt by Astral Flow.
+1 merit increases damage by +10%
Familiar
-Merit: Raises your pet's attributes for a longer duration.
+1 merit increases duration by 5 minutes.
Soul Voice
-Merit: Increases all song potency during Soul Voice.
+1 merit raises the effect by 2.
All in all, i think being able to merit 2 hours would be a great move, im not sure about DRG/BLU/PUP/COR/THF/NIN 2-hours, the THF/NIN 2-hours arent very useful so beefing them up would be kinda difficult. Any input or other ideas would be great, maybe we could throw this at SE during the next interview.