For the first issue, I can't really comment here apart from that the unit may briefly power up to cool itself down periodically.
With the second issue, it seems like the Video Plus+ mapping is incorrectly set up for Channel 5. Unfortunately, I cannot find any info in the manual on how to set up the channel mapping, but it seems like the mapping for Channel 5 has been incorectly set to L1. One thing to look out for in the Channel setting or Channel sort menus is for a Video Plus+ mapping (known as GCN on Lite-On recorders). For BBC1, this is 001, BBC2, this is 002 and so on up to Channel 5, which should be mapped to 005 from what I recall.
The third issue you have seems to be common with the vast majority of DVD players and recorder I have come across. Most DVD players power up with in a few seconds, so the ejection time does not seem unusually long, where as many DVD recorders take 10 seconds or longer to power up than DVD players, which makes it quite tedious to eject a disc from standby.
Finally, with your forth issue, it appears like the movie you recorded on the PC is in NTSC. While most DVD players will play back region NTSC discs (if disc or player is region free), unfortunately only a few convert the picture to PAL at 50Hz. Some DVD players simply convert the colouring to PAL, but leave the frame rate and size the same as most European TVs will play PAL at 60Hz. However, it looks like your DVD recorder retains the NTSC colour when playing back an NTSC disc. Most European TV's do not support NTSC colour and thus will show the picture in Black & White, as with attempting to display a SECAM picture on a PAL-only TV. If you encode your own movies, try setting the TV standard to 'PAL' if it gives this choice. Just be warned that the motion can get a litle jumpy during the conversion as frames need to be dropped when converting from NTSC to PAL.