Mount a damaged HFS volume in RW

I have a HFS external (USB) volume that suddenly became damaged (blaming it on my $5 USB hub, had corruption on another HD the same way)

When I plug it in, fsck runs and stops with the following:

/dev/rdisk3: ** Rebuilding catalog B-tree.

/dev/rdisk3: CreateNewBTree returned -34

/dev/rdisk3: Disk full error

/dev/rdisk3: ** The volume External 1TB could not be repaired.

The the volume gets mounted as RO.

If all it takes is to make space so it can rebuild the BTree, it's good because I have 100gb empty after that partition.

But, as the disk is mounted in RO, I can't resize the partition.

How can I mount this volume as RW?

Also, does anyone now how I can prevent fsck from running when I plug that volume?

I fully understand the risks of running a damaged volume in RW, etc, so there is no point having a philosophical debate about it 🙂