If you're using the proper project preset for your workflow, the field dominance will be reversed automatically.
This will give you a better quality video than de-interlacing.
What type of camcorder is your video coming from and what format do you ultimately plan to output?
Canon HV10, final output to mpeg2 1080x1440i. I've been doing this for 18 months and have always had to deinterlace clips before outputting.
What do you me by 'field dominance is reversed'?
You say you have needed to deinterlace in the past, why have you needed to? Also what project preset are you working with? Your Canon's clips are HDV MPEG2 and are upper field first. If you are working in a HDV project preset you should be Ok but if you are working in a standard definition DV project preset then it expects lower field first video and so you would need to reverse the field order.
Working in HDV preset 1080 25fps PAL.
If I don't deinterlace I get the usual jagged edges when objects are moving.
The only way to aviod this is to deinterlace. This was the case when I was using PE3 before I moved to PE7 and is still the case.
If I capture everything shot to PE7 it goes onto the timeline as one clip as PE7 can't split HDV footage. When this is the case I simply denterlace the whole clip in one go. However if I stop and start the camera, resulting in several clips, then each has to be deinterlaced.
I now use HDVSplit ver0.77 and of course this gives me multiple clips, each needing deinterlacing.
Are you viewing on your computer? If so then yes you need to deinterlace.
Yes I am and then outputting through a projector because of the often referred to inability for PE to be able to output in HD format back to Canon cameras though it can to Sonys. However a small contender in the video editing field, Magix Edit Pro can output to any camera.