Although the PAL decoding has come along way there have also been a massive amount of updates for the generic code between both systems.
Dropouts are better dealt with.
Now has a system for post process to make a frame accurate output (Decodes the VBI to detect repeated frames / missing frames.)
Discs can be merged - WIP (using multiple samples of the same pressing you can remove defects such as scratches and pick the video with the lowest SNR)
Better analogue audio
EFM Track is now demodulated and decoded and has recently had a massive improvement in the accuracy.
I am hoping to go and sample a set of 10 identical Dragons Lair discs in the next few months which will allow testing of the combining of discs and provide a dataset that will allow the possibility to improve the SNR over the copies.