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Actually, the original poster's question could be solved this way, since the SYM key doesn't do anything in plain reader mode. All you need is a script which executes the following in a continuous loop:
Code:
waitforkey 94
echo "send 124" > /proc/keypad
The problem with this is that it always converts the SYM key into NEXT PAGE, even when you are trying to type symbols into the search field. A more elegant solution would need to provide a hotkey to enable/disable this feature on demand (or a way to detect what the current UI action is)...