The Wiki states that you could insert blocks like cobble into the "pipe slot" of the miner to let him retract and fill up the tunnel. My problem is I can only put Pipes in there...
Miner working all normal and stuff but he wont let me put some "filling stuff" in the pipe slot so i allways have those nice little holes in my landscape ... (perfect for creeper griefing tho..)
testen with clean MC 1.2.3 jar and only
ModLoader 1.2.3
ModLoaderMP 1.2.3 v3
minecraftforge 1.4.1.59
IC2 1.81
and TMI 1.2.3