some issues

I think there are some issues:
1) could be nice to add “maximum exeuction time” limit option, because we get error MAXIMUM EXECUTION TIME 30 seconds ….when deleting duplicates.
2) there could be option for more than 500.
3) the “dupliacte” posts list should be after “save options” block, because sometimes the 1st problem listed above, causes to end execution of page before “save options” area is outputed, making plugin useless, until DB reset (because if i have once set accidentaly 500 posts to show for deletion and my site cant load 500 posts, because of 1st error, then i can never revert 500 back to 50 or whatever, because page is never loaded fully)