I maybe lazy but the 24 seconds duration is wayy to short.
This skill is the equivalent of one of diablo 2 assassin which was way more longer.
So i only use pneumatic burst for boss fights because it bores me to death to constantly look screen for seeing if it last or not.
Im waiting kindly ofr your oipnions.
Just wait a little until it becomes a habit
I have anger management issues 
Most of the time I have it on a repeat macro. I used to switch to manual triggering for tough bosses…can’t even be bothered with that these days.
“Macro and forget”
The last thing I’d want is a longer duration as it’s not only the +speed etc it’s the healing burst each time I activate it and it’s one of my favourite skills for being able to give me increased movement, damage and healing each time I fire it off.
As for “constantly looking at the screen” … well I tend to look at my char (which is on the screen ;)) while playing and it’s dead easy to see when PB has expired due to my char suddenly slowing down without any need for checking icons.
That would kill me…lol Need the healing on activation as I require and not find that it activated a few seconds before receiving a massive burst of damage, which happens with macro and forget
I assigned that skill to my mouse wheel… Just scrolling down every few seconds outside of boss fights shouldn’t be too much of an issue
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How would increasing the duration negatively impact the effects? All it would mean is you are required to refresh it less often so you could use the heal more reliably while maintaining the buff.
Pneumatic Burst is also one of my favourite skills. It is very good.
Though, increased duration does not mean longer cooldown. This issue has been brought up before and the skill is the way it is now. The way it functions now doesn’t bother me.
The cooldown is there pretty much purely for the heal, otherwise it would have just been a toggle, considering there really is no down time.
@OP if you don’t like how it is, make a mod to fix it how you want it. End of story.
I just thought the cooldown was tied to the duration as without BoB iirc you cannot refresh until PB has expired. Hence the thought that increasing the duration would also increase the cooldown. 
Duration and cooldown are independent of one another.