Shift+Ctrl+V harder? You do
not need to move your hand at all. It's resting at the
same position as usually and you just use one more finger to put it on "Shift" and do the
same action that you do when just pasting! :)
When using Shift+Insert, you have to move your another hand, locate Shift button and only then feel where the "Insert" is, press it and move hand back to your default position.
Of course, this a rather personal opinion :) That's why I would prefer the setting to change it as anyone wish instead of hardcoding it. :)