Note that as it's orange, it'll be OAT coolant - do NOT top it up with any blue / green coloured coolant, if you can't easily get hold of the correct coolant use pure water to top up instead.
I'm pretty sure there's OAT coolants in a variety of colours, and is available in at least blue, see here
I'm sure it's, in effect, just the dye used.
You shouldn't really have to top up the coolant at all, in between services - if you're losing coolant at any rate it's important to find out where it's going!
Mostly radiator / hoses. Don't think those lumps have form for head gasket failure. If it is a leak in the rad, though, unless you're selling it, imminently, don't just stick some leak sealer in. Most aren't well thought of, and I think only k-seal stands good vibes from "the trade".
And those Fords do have funky ECU programming, that means in the event of high engine temps, the car will run on alternating 2 cylinders (and blow air through the non-firing pair) to try and keep things at a normal temperature. You'd seriously notice this when driving, though, and I suspect the check engine light would be on. Can't say as I've encountered any other cars that claim this potential engine / head saving rationale, though, in the event of escalating engine temperatures. Maybe if K-series engines had something similar, then they wouldn't have quite the same reputation.