Current guideline stating "Objects should not be placed during a 1/1 long note's hold duration. However, using an object at the beginning or end of a long note is fine." might be a bit too vague and can use clarification.
First of all, it doesn't clearly imply if it is acceptable or not to place a rice note in the middle of a 2/1 hold, that is at the 1/1 mark. It also doesn't do a good job at telling if it is about no objects at all during a long note hold regardless of duration, or if it is acceptable of placing rice notes wherever on a hold as long as it is over 1/1, such as a 3/2 long note with a rice note after a 1/1 duration.
Depending on how this guideline should be interpreted, it needs to clearly differentiate when it is okay to place a rice note during a LN hold and when it is not, plus if it should be under strict scrutiny of a 1/1 hold or if it is 1/1 hold and longer. Since the most likely interpretation of this is there should be no rice notes before a 1/1 long note hold, it can be rewritten as follows:
Objects should not be placed before a 1/1 hold duration. However, using an object at the beginning or end of a long note is fine.
It both implicates that you cannot have 1/2 distances between a long note hold and a rice note, and by extension that you can place a rice note during a long note hold after a 1/1 distance have passed.
First of all, it doesn't clearly imply if it is acceptable or not to place a rice note in the middle of a 2/1 hold, that is at the 1/1 mark. It also doesn't do a good job at telling if it is about no objects at all during a long note hold regardless of duration, or if it is acceptable of placing rice notes wherever on a hold as long as it is over 1/1, such as a 3/2 long note with a rice note after a 1/1 duration.
Depending on how this guideline should be interpreted, it needs to clearly differentiate when it is okay to place a rice note during a LN hold and when it is not, plus if it should be under strict scrutiny of a 1/1 hold or if it is 1/1 hold and longer. Since the most likely interpretation of this is there should be no rice notes before a 1/1 long note hold, it can be rewritten as follows:
Objects should not be placed before a 1/1 hold duration. However, using an object at the beginning or end of a long note is fine.
It both implicates that you cannot have 1/2 distances between a long note hold and a rice note, and by extension that you can place a rice note during a long note hold after a 1/1 distance have passed.