In reply to nufkin:
I think your missing the point of the OP.
Of the pillars i've been on (Norway and aretes on indoor walls) i find the best practice os to offset feet and tools, as there isn't enough width to spread feet, even shoulder width (not really a pillar technique then) and obviously tools shouldn't be planted to close together.
George's advice on softly softly is always true
To the OP, steve house has a nice video soloing two thin routes, although not pillars (thin chimneys) good to watch some pecking action.
Steve House соловосхождение на Repentance и Remis…: