Extract / load tool or fdbcli feature

It would be really useful if there was a relatively easy mechanism to extract a given key range (or, better, set of key ranges) into a file, then to load those same key ranges into another target server (a bonus feature would have the restore process verify that the target key range is empty unless a flag was provided to force it). For example:

fdbcli> dump /tmp/alldata.out \x00 \xff

and

fdbcli> load --force /tmp/alldata.out