You're right Pete (and thanks for the reply chum) but Im really just trying to understand saddles a bit more.
My understanding was that each saddle was rated INDIVIDUALLY, but Ive now realised it's as a pair (think this a bit bonkers labelling, as it shows on BOTH my Vampire cells as 7.4v / 5400mAH, not 3.6v / 2700mAH as I would have expected)
What I was hoping to achieve is not at trackside (where you are right, I would only ever be charging two at a time), but at home, when putting on 1 charge (albeit twice as long) would be kinda nice - just turn on and forget about it for 2 hours. Come back, and take all cells to race.
Because I am making my own balance lead, I could easily make it with the above in mind so it could do both scenarios; but Im guessing it doesnt really make much sense now.
Sorry guys, I'll put it down to a senior moment and move on.
(although, got to say, I reckon Im not completely stupid about electronics, and when a single cell says 7.4v / 5400mAH on it, then I would always take it as rated at that - cant believe that Im the only one to think that about Lipo saddles)