I don't desperately need it, and like keepee said there are workarounds, like instead of using textwidth, you can multiply the textsize by the number of letters to set the width.
I just thought textwidth was designed to avoid doing that.
Don't worry about it, and keep up the great work.
As a side note, I know you said you wouldn't add rotation to the particle system, but do you think adding animation to the particle is possible ?
I know I could create my own particle system, but it just seems like a waste of energy when the existing particle system is great and only lacks animations