Limit of 4 threads in the VfW GUI

Greetings.

The VfW GUI limits the number of threads to 4 
(xvidcore/vfw/src/config.c, line 1478), but the core library has no such 
limitation. I know that the vertical resolution of the input effectively 
limits the number of threads that can be used, but is there a reason for 
hardcoding the limit in VfW to just 4? SysKin once warned about using 
"way too many" threads. Can >4 be too many for the algorithm to handle 
(can it cause crashes etc.)?

Best regards,
Marcin Jaworski