Renowned programmer Gabest famous for Media Player Classic and the extraordinary 'GSdx' has released the WIP sourcecode for a fantastic new CDVD/ISO plugin. It was created in an aim to improve direct DVD drive access and it already shows large improvements.
Those that are capable of compiling have the opportunity to try out a WIP plugin that already offers performance improvements over P.e.o.p.s CDVD plugin in numerous situations and games, including smooth framerate in Grandia 3 intro sequence. The plugin not only is capable of running DVDs and ISOs but also rare PS2 CDs such as Crash Bandicoot: The Wrath of Cortex.
As of revision 848 there no configuration dialog, but the drive or iso path can be placed in the source code within the cdvd.cpp file
for those that are interested the source is available HERE