Hi. I have a little suggestion for improving function finding.
There's no way remembering all functions by heart. So it would make it easier to find them faster: while scripting, the SED starts looking for functions starting with the lettering that was written.
For example I start writing ph_
and SED finds all the functions starting with that lettering in "function tab" and lists them with the needed arguments that go inside them.
1. Clicking on it makes it active and able to watch it's manual description in Command Help tab.
2. Double Clicking on the suitable function pastes it in script file. So you don't have to open up the manual in order to find the function and rewrite it in SED. If I do need to see what this function does I open up manual and look for it. (or do the first thing).
It would make things easier to find and more manageable, no need to jump between sed and manual (on another window) to write functions down.

Hope this goes trough!
Oh and using LiteC Free if that change is possible especially in there..

Crypton.
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Hmm found this section in Manual:
Inserting Commands which tells me to press Ctrl + Space to open up command list. Doesn't work for me :S