arjay,i shall drive into Phon Phisai today or tomorrow and i will ask.I noticed a dilapidated old house on the river bank with a sign in English saying Phon Phisai immigration office so i will ask there.Lots of building work going on so maybe a return to the old days when faramgs could go across and visas could be extended.This was way before my time.
Unfortunately, you cannot legally cross here as a farang, (though quietly it can be done) but with no benefit as far as a visa goes as to get a visa you need outward stamps plus incoming, none of which are avaialbe in Phon Phisai.
But Saturdays and Tuesdays are Thai - Laos market days and you might enjoy the festival atmosphere (and bargains if you are a good negotiator). Well worth a look if you are looking for a day out.
So much going on and so close to home if you take a look.