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I'll give my take on this.

First of all, "remaining" funds display is a good idea. However, I
believe it's just as well to say "Untied:" - as when you order a
unit you are "tying" up money.

Secondly, depending it on buildtime would not only be
somewhat hard to do, it would also have one huge flaw: There
are multiple build queues. If I order two m1a1s, it could say I
had ~12000 'untied' - but if I went to buy a helo for that sum,
dang, I don't have enough money.

So it isn't really useful unless you have a single-queue system,
which this isn't. And even then, it's almost assuming that you
will be producing constantly.

Besides, this isn't a bug (this is the bug tracker you're posting
to), and it isn't high enough on the payoff/devtime ratio that I
believe it will have much attention.