Hunkers DS2 is georgeous, and sleeps fine. (I think Hunker just keeps waking him up for cuddles at night coz he's so lovely.....)
From another perspective, ie mine , my DS used to just cry when he was tired. Didnt matter what i did either. Going for walks, driving, rocking, patting and up until 15 weeks feeding didnt really make him fall asleep either. In fact, he used to fuss and fight feeding in the evenings.
From birth until about 15-16 weeks he would just cry from about 6-7pm to 11pm whether he was being cuddled, b/fed, rocked, patted, left, whatever. There was nothign wrong with him as such - GP and HV no use, and we tried all the colic remedies. I used to lay in teh room with him for hours because i couldnt leave him, (which is strongly recommended here and there......) but there was nothing that would stop him crying because he was so so tired, but just couldnt sleep. Now THAT is very very wearing. Its the reason i found MN in the first place. I was at the end of my tether with it all.
I think my point here is that, its not always about getting into a routine, or not "allowing" comfort. Sometimes, babies just really really cannot get themselves off to sleep no matter what. So, can we move away from comments about what harm is being done, and how bad not to comfort etc. I think Pummy has got it now.