the cron has been removed not because of the complexity, but because too many servers can't handle the load of sending that many emails. Most dedicated servers handle it just fine, but virtual hosted domains don't work so well.
Since we customize each newsletter with information from our other sites, a cron was no longer useful for us, so I never had the big priority to add it in.
As far as development for this, anyone is free to make mods and distribute it. If it's a good one (and tested well, i'll add it in)
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