Actually, there's a good reason why I suggest taking the power from that point. The S-Video won't be always on, because most people will turn off their power supply / Monitor when they aren't using the CPC. More importantly, it ensures that the modulator has booted before the CPC, so it has time to initialise and stabilise the picture
I was thinking many people using a modulator won't have the original monitor including PSU anymore (my Plus at least can't drive both a plugged RGB and the modulator at the same time anyway) but rather use some PC or external switching PSU that stays on longer for other reasons outside the CPC anyway.
No harm except for the first flicker expected from using Pin 2 after the cartridge lock/power switch though I hope?
Additionally of course I had the situation that more frequent power cycles wouldn't hurt on the older IC which wouldn't always get the proper sync.
Regarding the capacitor: That bug has been removed in this version.
I wouldn't have doubted,

and clearly referred to the earlier model lest there be any misunderstanding among prospective customers of yours.
I've also made some other improvements, which improve the picture in some circumstances. There's also a further mod you can do, to improve the picture on the Plus (remove the vertical striping). I can upload the details here if anyone needs them.
By "vertical striping" you mean a "prison bar"-like effect of approximately MODE 1 character width, and especially shadowing on blue edges?
Very interested in any improvements I can make as I have to reseat the connector anyway.