Scheduled Transaction formula support string literal parameters.

[YaoCL]

Hi

I am creating a SX which calculate amount by a related account’s balance. I created a function like this
====
(define (gnc:balance accName)
	(let ((acc 	(gnc-account-lookup-by-full-name (gnc-get-current-root-account) accName)))
		(gnc-numeric-to-double (xaccAccountGetBalance acc))))
====

This function require a string parameter.  The gnc expression already support Quote symbols to refer to string literial since this commit.
<https://github.com/Gnucash/gnucash/commit/135289725c9cf439bf2e3bac017a5b1ba9589711>

But I can not input double quote symbols into the formula editor. I am not a developer of gnucash, Maybe my idea is naive. It looks like add get current balance feature is as simple as let me input the Quote symbols into formula.


References:
Some mail thread related to this topic 
<https://lists.gnucash.org/pipermail/gnucash-user/2008-December/027730.html>
<http://lists.gnucash.org/pipermail/gnucash-user/2014-January/051964.html>