Boolean transparency can be performed in any order, so you can use non-boxes straightforwardly. It's only semi-transparent textures or alpha-blended objects th

Boolean transparency can be performed in any order, so you can use non-boxes straightforwardly. It's only semi-transparent textures or alpha-blended objects that need more help if they're to be blended correctly relative to each other (and most situations will involve particle & sizzle effects, which don't need true correctness anyway).