In Project Settings -> Input, i defined a new Action Mapping called Sprint. Now in my character blueprint i want to check if this Sprint key is pressed. I can create a Get Player Controller node and wire it to Is Input Key Down but thats not i want. I mean something like Is Custom Input Key Down that lists the Action/Axis Mappings from Project Settings.
I want to post this on AnswerHub but before i do that i want to know if this is a missing feature or i am missing something.
Custom inputs are in the Input category and they’re global. 
Since there was a problem with a forum and some posts were lost I’ll post my tutorial for once again.
I understand that the hard part here is that you have one mapping associated with two different keys. Here’s what I would do:
Firstly, create an Axis Mapping and associate the keys you want with it:
Then you can create that blueprint:
Now if you want to check if any of the corresponding keys are pressed you just have to check the value of IsInputPressed variable.
I hope this is what you wanted. 
Thats what am actually doing now. I set a boolean to true if input key is pressed and set it to false when released. But i think a dedicated node like IsCustomInputKeyDown will be cool. 
You can always create that node yourself 
