Just a quick add-on, lets you create cylinders using spin modifiers with a bunch of non-destructive options for use with booleans etc.
Allows for flooring, thickening, adding/removing end caps, adjusting side count/radius/height, adding support loops and subdivisions and choosing between faceted or smoothed high-poly.
Nothing fancy but I figured a few people might get some use out of it 
Found free here: https://gumroad.com/l/OQRVC