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We also struggled to get the local scanners from our clients to works on our remote desktop/ terminal services servers to works. After some search we found TSScan and it works great and is also much cheaper than similar products. You should take a look at www.terminalworks.com/tsscan.php. I hope that helps.
You can scan from any application, scanning is like on local machine.Many options available.
We have 4 servers(20-40useres ) using TSScan, and it works great.
We use RemoteDesktopTwain from ScanWorks which allows easy to use locally connected scanners on remote server through MS Remote Desktop.