I don't even want self-destruct. Your immobilised in the middle of nowhere tank means someone put in a lot of work and effort into getting a sticky off on you at yellow health or luring your tank into a mine at yellow health after you used a repair kit.
It's now YOUR RESPONSIBILITY to waste mortar barrages, grenades, tank shots, even offmaps to kill the leech.
Not really - land mines on the remote flanks are incredibly common, and with the mobility of LATH and other such disabling units, its really not that difficult.
I'd be fine if immobilized units like that if it were easy to kill them (like with another tank) but with anything other than a mortar, its nearly impossible.