no deinterlace by default - why?

I notice that the deinterlace setting is always default on "no deinterlace". Does this mean that I can leave this setting like this? I understand from the docs that "telecide" is the best but I can imagine that since the DVD and the resulting SVCD both need interlacing that it makes no sence to deinterlace. What setting is required here?

No you don't have to deinterlace, but a good number of people like to. Telecide is generally considered the best. Interlacing is most commonly used when the output is going to be played on computers or hi-def TVs, both cases where interlacing is nonexistant.

to not deinterlace an interlaced source, you have to turn progressive frame off.

Deinterlace and jerky SVCD 

I apologize for appearing confused, but its because I'm new to this and I am :-) If I don't deinterlace an NTSC source (DVD2AVI shows it as NTSC, not film) the result with no deinterlace and DVD2SVCD is that any motion is jerky on my standalone Apex 1500 and standard TV (and CCE drops down to about .7~.8). I'm using multipass (3) with CCE and a max bitrate of 2230. Am i missing an obvious setting? I don't have the last log from an NTSC DVD, but I can recreate one if needed. Thanks, Zot