I did a quick speed test with Nero CD speed of various r/rw media and I would certainly recommend a 2nd DVDROM for reading DVDs.

Max reading speed.

Media_______A05_____Liteon 166S_____Pioneer 115

pressed DVD__8X______16X___________16X
4X DVD-R____6X_______9X____________6.5X
2X DVD-R____2X_______9X____________6.5X
2X DVD-RW___6X______9X____________6.5X
1X DVD-RW___2X______9X____________6.5X
Ripping_______2X_____>10X__________>5X

As you can see here A05 is crap as a reader. I strongly suggest Liet on 166 as a second DVDROM.