Send Esc sequence option in Keyboard-Custom Presses

It quickly becomes a burden to have to convert into HEX sequences for every Esc sequence I wan't to define.
It would be wonderful if the option to type in esc sequences was available, then it would be possible to just cut-paste in the desired sequence, instead of a) having to convert it to hex b) looking at an hex sequence and not be able to tell what sequence it is, without having to un-hex it again.

Using hex sequences is a lot of extra work, and ends up being impossible to read at a glance.

Start at the Keyboard-Custom Presses settings entry point and trace how custom sequences are currently entered and converted to hex. Compare the desired Esc-sequence input with the existing behavior, then verify that pasted sequences are accepted and remain understandable when edited.

Written by the indexing model from the issue text.