I'm using a mortscript to start SlingPlayer Mobile, which is allowing me to start SlingPlayer Mobile in landscape or portrait mode. Basically, when I start SlingPlayer, it asks a question, rotates the screen, starts SlingPlayer, then rotates back upon exit (if I tell it to turn).

To do this hack, you need mortscript - available here.

Here's the script that will do the dirty work:

Switch (question ( "Rotate screen for Slingmobile?", "SlingMobile Launcher", "YesNoCancel" ))
case (1)
Rotate(90)
Runwait( "\Program Files\Sling Media\SlingPlayer Mobile\SlingPlayer.exe" )
Rotate(0)
case (0)
Run( "\Program Files\Sling Media\SlingPlayer Mobile\SlingPlayer.exe" )
case (2)
EndSwitch

To use this script, install mortscript, then cut/paste the above script (starting with the line 'Switch' and ending with 'EndSwitch') into a text file named 'SlingplayerLauncher.mscr and launch it using your favorite launcher (I'm actually launching this from SPB Mobile Shell 2.0, as an added item under multimedia).

Upon starting it, it'll prompt you and ask if you want to rotate your screen.. yes/no/cancel. If you say yes, it'll rotate/run slingplayer/then un-rotate...

Hope this helps someone.. Original script is from xda (and meant for tomtom..)