I can't find anywhere a guide to setting up worms for infitie rope uses, it only lets me use it twice and then forces me to fall, i can't do any cool rope tricks with only two ropes! also how do i convert a .png file to a worms map (.bit)

Turn the rope power up to 5 stars in the weapon settings, and you don't need to convert .png's, just put them into the SavedLevels folder and use the drop down box in the level editor to load them.