Reason with clutchless shifting between 1st and 2nd is that there is the big hole of nothing nuss gear (nuetral) and if your giving it the shit off the line and smake her into nuetral then all you get is a loud noise coming from the engine and blushed cheeks (along with the normal fucks and bollocks) as soon as your in 2nd you can knock her up the box (WHEY!!!! ) and off you go.
If done right with little crunching and nasty sounds then you shouldn't be cocking up the clutch but if your doing it on a daily basis and have the legs and co ordination of an epileptic gibbon then your going to screw it up faster than normal. So when i clutchless shift i only do so on motorways and duel carridge ways as i want to get as much speed as fast a poss on them slip roads so the dick in the BMW dont dry ram my star fish.
Its not bad habbit in my mind as long as its not done ALL the time, as said M-ways and Duel carridge ways are the best times to use it but in town going past weatehr spoons you look a cock when you fuck up (1st - 2nd gear )
As for going down the box, this is what i cant do and dont do, you have to be going so much slower than you think for the syncrodes to line up for it to pop in, and by this time you would have be faster to just pull the clutch, only man ive seen do it was Casey Stoner (i know sorry for bringing in a GP rider) but he pretty much stamped on the peg to jam it down and kicked the back wheel out at the same time, it that really what you wanna do on the road?............................................... actuall that sounds pretty cool
Stay safe hun