Hyperplane: Teneseged answered my two questions correctly. I know it, because I had the chance to try out the R1:
Yes, one can fast forward and rewind as you say, but I want these functions with sound and when one fast forwards and rewinds, one can't hear anything. Midtrack resume means, that the recorder remembers the stop position and starts at it, when it's switched on again later.
The Nagra Ares-m at least has fast forward and rewind with sound. It's not necessarily a tapers machine, since it can't do 24/96, but it is my favorite flash recorder at the moment.