Suggestion for more flexible masks in QLineEdit

A masked edit is available, but misses "Insert" character capability (not always overwrite mode);

For example:
preconfigured types for double value input and integer value input (right aligned input, fractional part
is left aligned) displaying the input mask (like: ____._EUR).
It would be nice if there was functionality for having the user start inputing characters on the focusin at the left of the "." character insted of
the leftmoust with overwriting (the same for integer input).