I agree the use of cursors to turn is a gross omission in Skyrim, I played all FPP games in the past with cursors & used the mouse to aim or HUD actions, when using the mouse to turn you have to keep lifting the mouse off the mouse mat and then turning again, this causes a delay and is a lot less efficient than just tapping or holding the cursor key as anyone who plays FPP shooters knows, also if you have RSI which makes constant mouse use difficult this can ruin the game. I have noticed other Steam based FPP games dropping cursor support and it's an absolute nightmare.
As a solution, download autohotkey from autohotkey.com and use a script like the one below to use the left and right mouse cursors in Skyrim to turn left and right, however there are a few issues, e.g. for some reason the movement is reversed when in overview mode vs. driving mode, so if you use overview mode you might need to switch the left & right statements below. You might also want to change the speed settings shown as 99 below, 100 is the slowest 0 is fastest mouse movement. Notice also how I have had to save the vertical cords and then set the current Y position back to this to avoid sending the view to the top of the screen, this happened when using a more basic script such as
MouseMove, 1, 0, 0, R.
If anyone can come up something better I'd be interested to see this.
P.s. you can also compile the script into an executable (exe) file which can make it easier to run at startup etc.
#NoEnv ; Recommended for performance and compatibility with future AutoHotkey releases.
; #Warn ; Enable warnings to assist with detecting common errors.
SendMode Input ; Recommended for new scripts due to its superior speed and reliability.
SetWorkingDir %A_ScriptDir% ; Ensures a consistent starting directory.
CoordMode, Mouse, Screen
MouseGetPos, xpos, ypos
MouseMove, -1, -1+1, 99, R
MouseGetPos, lxpos, lypos
MouseMove, lxpos, ypos
MouseMove, 1, -1+1, 99, R
MouseGetPos, rxpos, rypos
MouseMove, rxpos, ypos