Bad working tree format branching smart server for content filtering

[Frits Jalvingh]

Hello,

I'm in the process of converting our repositories to use CRLF content 
filtering this weekend but I'm running into trouble again. I tested this using 
simple transports and all goes well; when I branch a repo I get a new repo 
using WorkingTreeFormat5:

Format:
       control: Meta directory format 1
  working tree: Working tree format 5
        branch: Branch format 7
    repository: Packs 6 rich-root (uses btree indexes, requires bzr 1.9)

which is OK for content filtering. But when I branch off a bzr 1.16.1 smart 
server I get a WorkingTreeFormat4:

Format:
       control: Meta directory format 1
  working tree: Working tree format 4
        branch: Branch format 7
    repository: Packs 6 rich-root (uses btree indexes, requires bzr 1.9)

which is NOT OK for content filtering (and consequently the tree created has 
incorrect line endings). 

Is there someplace where the default working tree format can be set? If 
necessary by patching bzr?

Frits