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MDB_TOOL mode vs. large mdb_env_set_maxreaders()?

If an lmdb application configures a non-default maxreaders,
this setting is ignored if a tool like mdb_copy is already
running (maybe from crontab).

I suggest mdb_copy & co should use an MDB_TOOL env flag
which requires the lockfile (if any) to be valid, and only
partly reinitializes it.  The upcoming MDB_ROBUST flag might
also make use of this.  An alternative would be to stuff
this into the metapages, but that seems less flexible.