I noticed there's a small pair of wheels on Landmine's feet(The pressurized tanks), lining up with the rear wheels which becomes his heels, which should allow him to skate, but I'm having trouble finding the right alignment or setup to do so. Is it even possible, or a screwup on the design process?

Are you trying to make him rollerblade, as in actually scoot along by himself with a push? I don't think that's possible, he's prob not stable enought for that.

However, a static 'blading pose is doable, that's how I have one of my 2 Landmines right now. I'll take a pic tonight and post in this reply. FWIW...

One of your TWO Landmines?! I just want to find oooone...

You simply have to hold the figure and push him along, he wont Free-Wheel but his wheels do rotate.

The former. I believe Landmine's poseable enough to do it, say with a skiing pose, but locking the heel in also locks the wheels in place.