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You should just not call the releaseKey function, until the button is released.

void loop() 
{
    val1 = digitalRead(inpin1);
    if(val1 != HIGH)
    {
        buf[2] = 80; // Left Arrow
        Serial.write(buf, 8);
    }
    else
    {
        releaseKey();
    }

    val2 = digitalRead(inpin2);
    if(val2 != HIGH)
    {
        buf[2] = 79; // Right Arrow
        Serial.write(buf, 8);
    } 
    else 
    {
        releaseKey();
    }

}