I don't think creating a forwarder for bootmii (directly) is possible: it actually loads before the USB loader, so by the time the loader is loaded, it'll be too late. I think it's best to create a forwarder to an applet that'll set the parameters correct to restart the wii into bootmii or sneek mode. I know bootmiiswitch can do the former, but for the latter...I don't know.
@mugotu: I know how much effort you and Spayrosam do to make things as easy as possible, but that doesn't make the actual creation a piece of cake. I followed all the instructions I could find to make me a forwarder for wiimc, but even though it created a nice rar-file with the ISO and good-looking covers, and wii game manager made it into a wbfs file without problems, the actual forwarder simply didn't work. Under 222, it blackscreens, and under 249 (base of 37), it gives the following error:
"error: openpartition (0x50000) -64 returned (ret = -64)"
(I use CFG v56-222, v5 of Hermes's 222 and rev 19 base IOS 37 of Waninkoko's cIOS...other ISO forwarders I downloaded work fine...this is the first one I try to make myself).
Oh, and when I try to run version 4 of 3ISO studio, my virus scanner warns me about "Win32:Malware-gen".
I'm sorry, but it just doesn't look 'too easy' to me.