Hi svetter88,
Sorry for coming in late but I think your 2nd question has not been answered yet.
I don't believe Reiser can be "converted" in one shot to any other file system. It requires a reformat in the new FS, so this implies a copy of your files first.
There exist some tools to make the process easier though. Take a look at
Convert Filesystem from reiserFS to ext3 « Bozzie Software
But if your partition isn't the root partition, then using rsync to copy the data , symlinks, hidden files, etc. on another partition or disk will be fine.