[REQ] Render update value

[zeitmeister]

Hi,
I think it would be very useful to tell Indigo when to update the render window.
Like halt time value or saving period.

When rendering large formats in network; uploading images from all clients can take quite long... sometimes longer than the updating period.
So an input field for that in seconds woild be very useful and make rendering large images more stable in some cases.

What do you think?

Regards, David