Nibal,
Thanks for the feature request, however, You should be monitoring your line weights in your CTB file. Setting your layer colors to plot at a certain thickness through the plot style is more appropriate for your laterals and sleeves. Please take a look at the links below on how to modify your CTB files to affect your line thicknesses.
Modify Existing CTB Plot Styles
About CTB Plot Styles
Also, if you would like to give it a try, we do have a sleeve option that is a solid thick line, which might work best for you. See the link below on choosing a sleeve option.
Pipe Sleeves