Would be nice to be able to define what color/trasparency should be used when opening file based on the file extension. I think it is usual to have 'favorite' color schema and it is boring to set colors with each layer...
I desire this feature as well. In addition it would also be nice to set a default layer order/sorting for particular file extensions. For example I always want my drill data (.drd) and paste mask (.stc,.sts) to be higher than the etch layers (.cmp, .sol).