Hmm,
I posted about this before but I will post it again. The only good one I know of out there and yes I have been thru them all is Trackback Generator by Joey T. Now it's not for sale anymore as it was limited to 150 copies so it should give you a clue as to how sick it is.
With that said, you could probably get you something done at Elance or Scriptlance. Try to get one that you do not have to install on a server, rather a desktop application that is multi threaded in Winsock. This way it will execute socks simultaneously and not chew up your resources. I personally execute harvesting trackbacks at 10 socks and I submit at around 60 socks.
I use the TBG on a standalone machine that is used solely for this. It's on a Max Cap service connection and I think the most usage it has ever used is 12% or less.
So about the only thing I can help with is giving you the requirements if you were to go get your own tool made. I also suggest it as I been have thru Submit Trackback, TrackbackSpider, Linkwhore and others and none of them even stands a lick against Joe's multi threaded Winsock program. You might get some links from them, maybe even enough that your happy and some $$$ is coming in. But, if your trying to rank hundreds of pages and blog posts and have a high goal of hundreds per day, I just can't see any of those doing it, at least for me they couldn't.
Best,
Ruck