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Do you know whether 512-column PS2 games use different dot clock than usual 480i games (858 dots per line), or whether PS2 internally scales framebuffer width to usual 640/720 output? At least PS1 has suitable timings for 512px modes, so it’d be a bit strange if PS2 games could not use that.
@paulb_nl: the trick of dual clocks in Line3x 4:3 mode is a bit hacky, and while something similar could be done for Line2x (e.g. output = 5/2 * input), it wouldn’t be very flexible.
@thomago: Now that I checked, 240p/288p/384p/480i/576i processing in Line2x uses 2x sampling internally (to minimize jitter and to generate a frequency within PLL lock range), which does not really work if samplerate is increased significantly (e.g. from 858 to 2046). I could add a check which causes fall back to 1x sampling if e.g. sampling rate is more than doubled.