Better handling of potential duplicates when importing directories

In my filesystem I have

simtelnet/handheld which contains, for example, simtelnet/handheld/adventure

but there is also simtelnet/handheld/handheld/adventure

This causes scfg to declare

"Duplicate dir: HANDHELDADVENTUR"

It would be nice if scfg made an attempt to create a unique directory name rather than failing.