As I say, the Back of Beyond lists I've posted (5 in all) are simply conversions of the Back of beyond lists, which in this case actually includes a staff officer in the original list. The back of beyond Bolsheviks are described in the original lists (by Chris Peers) as of slightly higher standard than normal Russian troops, simply due to the fact that by the time they' ve received their postings to the obscure corner of the world they re stationed in, most of those troops who want to desert have already had ample chance to do so... those left will thus be disproportionately of slightly higher quality. The Bolshevick command radius is a pretty poor 8", and the staff officer only boosts this to the 12" standard for some other armies.
In the back of beyond milueau the Bolsheviks are prebably the most regular army (unless someone is using british...which none of my group are)and are allowed a staff officer; the nearest regular competitors are Warlord Chinese (my own army). I came up with the conversion stats fairly easily as Back of beyond is a supplement for Contemptable Little Armies- a set of WW1 rules. By cross referencing eg CLA British stats with GW British stats, and then comparing them with CLA Chinese Warlord stats, I was able to come up with GW stats for Warlord Chinese. Similarly with russians. The scale in Back of Beyond is probably smaller than a WW1 or CW game, and I suppose the Staff Officer simply represents an actual professional army officer rather than an Apparatchick or Bloody Handed Brute ( a characteristic owned by many Back of beyond military leaders).
For our games we'll be keeping the cavalry squadrons for Bolshevicks and Chinese; it simply helps to differentiate them from the more irregular forces who do indeed purchase them by troop. Having said that these lists are really only intended for the group of half dozen players I meet with to play these GW rules with our existing Bob armies. If you want to interpret how to convert the Bob lists differently go for it- I did have to make certain judgements and choices in the conversion process, and I could have chosen differently, so my conclusions are hardly definative.