Your clarification means a lot -- "baked" potato in the U.S. tends to be a whole potato cooked on its own, where the insides become fluffy and creamy, and is done with larger starchy white potatoes, or sweet potatoes work well, too.
Roasted potatoes, on the other hand, tends to be (in the U.S.) be smaller "new" potatoes, waxy potatoes, or even larger starchy potatoes cut up (eg, 'oven fries').
The starchy potatoes only really hold up well when roasting if it's very high heat or a short amount of time -- if you're going to be cooking them with the roast as there's going to be moisture in there, I'd go for a waxy potato (eg, Red Bliss).
As for the browning -- probably coat them well with oil, and if they're not brown enough for your liking when you pull the roast, as you're going to have to rest it anyway, drain the meat juices, crank the oven up to somewhere around 450F (230C) and leave the potatoes in for a few extra minutes.
ps. yes, I know a sweet potato isn't a potato. And I also tend to use Yukon Gold for just about everything, as it makes great baked potatoes, and roasted potatoes (although, not sure how well with a roast at the same time) and they're good in pot roast and stews if you don't add them too early.
Grilling / broiling the potato after it comes out of the microwave is quicker than baking it and achieves the same crispy outside.
If you really prefer them baked though, you can speed this up by inserting a large metal skewer into the potato while it's in the oven
Best Answer
If you're going to be using a ricer, just halve the potatoes -- you can then put them cut side-down into the ricer, and then press -- the skin will be left behind. (I'd still give them a quick scrub before boiling them, though). Of course, this is easier, but not necessarily faster as it'll take longer for the potatoes to cook through.
If you bake them, just clean, bake, then cut in half, and put through the ricer. (Again, not really that much faster).
If you're cooking red potatoes, even if you're not using a ricer, there's no need to peel them beforehand, as you can boil them whole, then rub the skin off with a dry towel. (of course, for red potatoes, they're always going to be lumpy, and have texture, so in that case, I tend to leave the skins on).
To reduce the overall time, if I'm going to be going for a smooth mash: