Still talking only to myself 
Comparing the Arduino hardware/arduino/sam/system/libsam/[source|include]/wdt.[c|h]
with the Atmel Framework version of wdt.[c|h]
I see, that Atmel provides already an wdt_init(),
uint32_t wdt_get_timeout_value(uint32_t ul_us, uint32_t ul_sclk);
void wdt_init(Wdt *p_wdt, uint32_t ul_mode, uint16_t us_counter,
uint16_t us_delta);
void wdt_disable(Wdt *p_wdt);
void wdt_restart(Wdt *p_wdt);
uint32_t wdt_get_status(Wdt *p_wdt);
uint32_t wdt_get_us_timeout_period(Wdt *p_wdt, uint32_t ul_sclk);
whereas Arduino provides as counterpart WDT_Enable()
extern void WDT_Enable( Wdt* pWDT, uint32_t dwMode ) ;
extern void WDT_Disable( Wdt* pWDT ) ;
extern void WDT_Restart( Wdt* pWDT ) ;
extern uint32_t WDT_GetStatus( Wdt* pWDT ) ;
extern uint32_t WDT_GetPeriod( uint32_t dwMs ) ;
So I think, that the new weak function should be named WDT_Initialze(), to avoid confusion.
Are there any readers here, which work on the that layer of libraries?