The tediousness is a function of how Duels taps your mana for you and how hard it is to be precise with it. That's not a failing of the deck, but it certainly is a concern if you're not in the mood to waste time on mana-tapping.?
I agree, it's a failing of the game not the deck's design.
Anyway, I like the idea of a basically creatureless control deck, it's the way I like to play. Titan is just removal on a stick and Demon is the Demonic Tutor we have access to. Other than that, it's just burn, permission, and card draw. It has tremendous game in the control mirror because of all the uncounterable damage you can present, which is excellent.
Absolutely, I like that style of play too.
Regarding "four-color", this is basically an Izzet deck with a very light green splash and a very light black splash. If it weren't for the trilands and Traumatic Visions, you wouldn't be able to get away with it but why not stretch your manabase if you get to choose from a wider range of spells?
Absolutely, there's nothing wrong with splashing, at most it's a pragmatic compromise on the thematics of the deck.
Personally though, I consider this splashing concept and my internal monologue says: 'yeah, but however much you justify it to yourself by calling what you're doing
splashing, really, it's a four colour deck with a
splash of denial. It's hard for me to draw anything but an arbitrary line about how many mana symbols represent a 'splash' and how many the out-right inclusion of a colour.
But again, my mental demons are my own cross to bear -- carry on.