[Bf-funboard] Render pause

[Myvain]

With Esc, we can stop a render but we don't have the ability to resuming it.
Close yours eyes and imagine : you are on the beach, the weather is nice, and... ahem... no... simply imagine you have just launched a big render task who will take several minutes or a few hours to finish and while waiting you decide to work on another scene. Until there it is a little slow but possible. While working on this second scene comes the moment to makes some preview render, but the first render take again 100% of the cpu time. it's sloooow ! 
With the ability to pause the render we can temporarily suspend the first render to concentrate some minutes on the second work or secondary tasks (urgent need to send an email, to answer a chat's contact, to look a video, to make some researches) without all being slowed down by the render.
Is it possible ?
With the work on render api, is it a feature wich could be established ?

(sorry for my poor english, there is a lot of google translation in this text :/. Thank you for your 'indulgence')