Arc Gui (beta)

[Razor12911]

I know, you also mentioned "Yes, but on level -m0 may again lzma? Initially it was Lzma..."
for -m0, you can just add "store" in the combobox for methods, then add lzma, srep+lzma, precomp+srep+lzma so it becomes
store
lzma
srep+lzma
precomp+lzma

then under lzma level, remove store.

I'm not saying you're idea is incorrect, it just makes sense, probably sharing what I would have done.