This issue has been closed as 'Won't Fix' due to an extended period of time without updates. If this issue is important to you please let us know by posting on the AnswerHub or UDN, and Epic will re-open the ticket for further review.
A number of input keys from Slovakian keyboards do not appear in the input mapping context menus when pressed. Some examples are:
ľ,š,č,ť,ž,ý,á,í,é
[Not Reproduced Internally]
Results
Selection does not appear in input mapping context menu
Expected
Selection appears in input mapping context menu
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-34945 in the post.