What ever works. But I'll wager than if non-shorting caps are beneficial, shorting caps will be even more so. In this case, the "why" is no mystery.
Speaking of shorting caps and understanding them, here's a story Bill Johnson told at an instore appearance I attended in the 80's: ARC sent Harry Pearson their new SP-10 pre-amp for review, and shortly thereafter received a call from Pearson, who told Johnson there was something wrong with the pre. Bill, in an attempt to diagnose the problem over the phone, asked Harry some questions, and soon had his answer; Pearson had installed shorting plugs in the pre-amp's unused output RCA's. Well duh!
J. Gordon Holt evaluated the sound of components, be he also understood how they worked, having a technical electronic education. Pearson may have had a good ear, but was completely ignorant, technically. Having both is not a bad idea; it's a great b*llsh*t filter.
