One knee is stuffed, as well as a few other parts after a bad cycling accident around 8 years ago, so NO Kneeling for me ... effects my arm/fingers as well on my fretting hand, can lose all feeling in my hand for no apparent reason, couldn't make a chord to save my life when it's like that .....hence the interest in slide becoming more apparent.... Open tuning has worked for Keef for years....might as well improvise.