In most cases, yes you can control the size of a technique as it would be rather cumbersome to have it effect you as well. So yes, you can control the barriers' size to make it more specific in this case. The "per tun" usually means at the start of your turn, as long as this remains active - you will drain chakra from the opponent. Do note however, you cannot go over your natural threshold. Meaning if your body can hold a max of 1600 chakra, you cant absorb anymore if you reach back to this maximum.
I should mention, don't just look at some techniques as "battle only". The communication scroll is amazing Ninja World Utility; as it allows you to keep in contact with allies alike, so if you need help from me i.e - you can message me to come and aid you in the ninja world by sending me a message of your location. Don't sleep on techniques like this is all I'm saying, sure it has no battle use but out of it in NW? An amazing technique.
Honestly, its as it mentions "This prevents the target from moving, molding chakra or even being summoned."; its essentially that if you managed to capture someone - i.e knocking them unconscious - you can apply this tag directly unto them to basically make it impossible for them to move or escape. In terms of uses? As mentioned, id really only use this as a means of capturing a target further than I already have with it to suppress their movement and ability to mold chakra.
I should mention, don't just look at some techniques as "battle only". The communication scroll is amazing Ninja World Utility; as it allows you to keep in contact with allies alike, so if you need help from me i.e - you can message me to come and aid you in the ninja world by sending me a message of your location. Don't sleep on techniques like this is all I'm saying, sure it has no battle use but out of it in NW? An amazing technique.
Honestly, its as it mentions "This prevents the target from moving, molding chakra or even being summoned."; its essentially that if you managed to capture someone - i.e knocking them unconscious - you can apply this tag directly unto them to basically make it impossible for them to move or escape. In terms of uses? As mentioned, id really only use this as a means of capturing a target further than I already have with it to suppress their movement and ability to mold chakra.