I used to answe with a straight "No" if you can provide sufficient warmth and LIGHT over the dark, cold winter months. Recently acquired clones have died back all on their own, so now I am not so sure the advice applies in all instances. However, I did nothing to encourage the event, so I think that you need not worry. Their dormancy seems advantageous rather than mandatory (not like the U.S. temperate species). If you can't provide abundant light, I think it best to allow them to go dormant to conserve the gains made during the growing season. That's what I did last season when I did not have the use of my HID lighting. Plants went dormant on their own with the cold weather here in early October, and were overwintered with my Sarracenia, just above freezing with occasional light frost, and returned to their full splenour by July. I grow all my forms outdoors, or under HID light, having poor success with flourescents (and I use a lot of those!). Dormancy is triggered by cold conditions, growth is maintained in most forms when they are kept warm, but without a lot of light, they etiolate terribly. It is very difficult to get the crown of the rosettes close enough to the light tubes when the plants are mature due to the long petioles the plants produce, although juvenille forms do ok provided you keep the crown close to the lights.