I have just run tests by contact printing a step tablet on different papers, developed in different developers and toned in different toners for various times. The findings are not yet fully analysed. I developed Ilford MGIV in DS-14 and Ansco 130 and toned the stripes in polysulfide toner prepared according to the IPI Silver Lock formula. My toning times at room temperature were 30s, 1,5 min, 4,5 min and 13,5 min. After that the toning was stopped in Na-sulfite bath.
The effect in the three first stipes was a slight increase in density (especially low midtones), maybe a minor increase in contrast and cooling in tone (if there was any greenish tone, it was gone). The longest toning time, 14,5 min resulted in hue shift towards cold brown in the lighter tones with no visible change in the dark tones. The result was the same with both developers.
Hope this helps,
Olli