If it is not acceptable to your group that some abilities are 'up to x' and others are simply 'x' then there will be problems in other parts of the rules.
What if I want an ability that normally lasts 10 minutes to only last 5 minutes? Aside from useing a lower level of ability (caster/manifestor level) certain abilities have the (d) descriptor to say that you can use an action to end them early. Otherwise they go for their full duration.
A place where limiting being a potential problem would be with the psionic delay feat. You can choose to make it explode in 5 rounds or with some other conditions, but you do not get to choose 'up to 5 rounds', it is merely 5 or some other condition. Which means that if you have something like time stop you cannot put a bunch of delayed area of effects and have them all go off at once because you said 5 rounds for the first and 4 rounds for the second, etc.
In this case the areas are what they are. If it says 'X' (whether X is level based or not) instead of 'up to x' then that is what it means.
Doing otherwise can, and likely will, effect the overall power of various abilities.
As apparently you yourself have seen.
What if I want an ability that normally lasts 10 minutes to only last 5 minutes? Aside from useing a lower level of ability (caster/manifestor level) certain abilities have the (d) descriptor to say that you can use an action to end them early. Otherwise they go for their full duration.
A place where limiting being a potential problem would be with the psionic delay feat. You can choose to make it explode in 5 rounds or with some other conditions, but you do not get to choose 'up to 5 rounds', it is merely 5 or some other condition. Which means that if you have something like time stop you cannot put a bunch of delayed area of effects and have them all go off at once because you said 5 rounds for the first and 4 rounds for the second, etc.
In this case the areas are what they are. If it says 'X' (whether X is level based or not) instead of 'up to x' then that is what it means.
Doing otherwise can, and likely will, effect the overall power of various abilities.
As apparently you yourself have seen.