Sorry for the delay.
1. Yes they can.
2. It doesn't explicitly say so I assume you can adjust the sizes.
Now for the AACTs.
Fuuinjutsu: Kami Komyunikēshon) Sealing Arts: Scroll Communication technique
Type: Supplementary
Rank: B-Rank
Range: N/A
Chakra: 20
Damage: N/A
Description:
The user will create 2 or more scrolls with an embedded sealing formula that connects them all together. As such, anything written in one scroll will appear written in all the connected scrolls. A very useful communication technique, it can connect scrolls regardless of the distance between them. To activate the scroll, the user needs to perform a key of hand seals that will be unique for each creation and only known to those the user wishes, preventing the use of the scrolls by those the user doesn't allow.
Not useful in battle, perfect for NW rp though..
(Fuuinjutsu: Haisui Chakura) Sealing Arts: Chakra Draining Seal
Type: Supplementary/Defensive
Rank: S-Rank
Range: Short
Chakra: 40 (drains 100 chakra per turn)
Damage: N/A
Description:
This is a simple seal where the user does 2 simple handseals and slams his ground on a surface. Upon that surface, a 2 meter diameter sealing formula circle of kanjis and markings spreads, activating the technique. Any enemy that makes contact with the formula becomes unable to mold chakra as the sealing technique drains his chakra and his stamina. If the enemy manages to escape the seal, he will recover use of his chakra.
Note: Usable twice per battle.
Pretty self explanatory, but a bit difficult to set up tbh
(Juinjutsu: Hayaguchikotoba Shīru) Cursed Seal Technique: Tongue Twister Seal
Type: Supplementary/Defensive
Rank: S-Rank
Range: Short
Chakra: 40
Damage: N/A
Description:
This Cursed Seal was the one given to all members of the ANBU subgroup Root by Danzō Shimura, to ensure no information about Danzō or the organization could fall into the wrong hands. After Danzō died, the seals disappeared from all the Root members. When the wearer of this Cursed Seal speaks about anything incriminating related to Danzō or Root, their entire body will be paralysed, taking away their ability to speak or move. In the place it is applied, it takes the shape of three solid lines and two broken lines. The seal can also be applied during combat, and can secretly be placed on the opponent's body upon momentary physical contact. When the user activates it, the curse seal's marks spread around the opponent's body, paralysing them. However, one can break free from the seal with a strong enough release of chakra.
Note: Usable twice
Now, this seal isn't explained as thoroughly as the others in the manga, so a lot of it's ideas and backgrounds on how it works is guesswork, but the core concept is you create a seal that uses your chakra in a way as to bind the target should they speak out against you (not sure if it works solely in this way in the RP) by the seal activating and spreading over the body, negating movement and preventing them from speaking. It can be broken by a strong release of chakra, which I interpret to mean either a Forbidden chakra surge or S rank and higher.