Confused on Activities' behaviour in concert with browsers

[Antonis Kanouras]

Hello,

I originally asked in #plasma but, after receiving no answer, I took the 
courage to post here. Feel free to flame me if it's not the right venue.

I'm trying out Plasma Activities on KDE SC 4.9.3 (Kubuntu 12.10), and more 
specifically, with rekonq.

I've set it to restore the previously opened tabs at startup and have one 
window for each activity, with different tabs open on each. Now, if I quit 
rekonq (not just close the window) and start it up again, all its windows 
appear on the current activity.

Is this the expected behaviour? If not, how could I help implement it? Perhaps 
a kwin script?

Thanks,
Antonis Kanouras

PS: Please CC any replies to me as I'm not subscribed to the list.