Changing the Compose Key in KDE
I'm using OpenSuse with KDE, and was having a similar problem. Found my answer here: http://userbase.kde.org/Tutorials/ComposeKey/en#Current_KDE_Configuration. I've managed to get altgr to be compose, and ß and ← and → work fine for me.
That is:
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Start System Settings
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Select Input Devices then Keyboard
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Click the Advanced tab
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Click the box next to Configure Keyboard Options to enable changing keyboard options
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Click the
>icon next to Position of Compose key to show drop-down options -
Click the box next to the desired key to enable it.