questions about resume playback (ipod 5g)

[tamago]

as i mentioned in my title... i am using ipod 5g and my build is the one on 10th mar (forgot the exact build no.).

i've just updated to this build these few days. however, i found that the resume playback is a bit strange. as i am using the build before (i believed it was something on feb), if my earphone is not plugged, even i choose resume music, it will be in "pause" status.

ok, that's only the part of my problem. another problem is that it will resume the music from where i stop last time. but what i want is to play the song from the starting point (00:00).

to deal with this problem, i've checked the wiki and my settings. to my first question, i've set "pause on earphone unplug" to "yes"; and also "disable resume on startup if phones unplugged" to "yes". but the problem can't solve...
to the second question, i remeber there is a setting before which can set "resume" to "ask, off, on..." something like that. however, i can't find that on my build. i've searched wiki for information. i tried to add command in my .rockbox/config.cfg file, i added "resume: off" (exactly the one in quotation). however, i doesn't work. i check the file again and i found it automatically delete my command........ i've tried this several times no matter using my pc to add or using the text editor in my rockbox, it doesn't work..

i want to ask whether these two function is removed or is there any other method to deal with?
thank you for your kindly help and sorry for my poor english....