Keep the cooldown for breaking the sparrow but for the love of Shaxx, make all of them spawn immediately so we can use our favorite sparrow/ghost combo and not having to go through 20 combos from the vault/DIM just to find a working one.
While you are at it you may as well set the speed of all legendary/exotic sparrows to 160.
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Or. You could get a sparrow with the Transmat Preloader perk and never take it off, then you can use whatever ghost you want. Delete every other sparrow you own. Easy.