I've got it working !

1.
I made some changes to the webremote.itcl module.
I replaced version checking code (at the end of the file) :

if {$::version <= 5} {
register_module "sendkey" "Web Remote" "A Web-based Remote Control for your TiVo"
}

2.
created "devbin" directory in the Tivo root. And placed "sendkey" file in there. Made sure that it is executable : chmod 755 sendkey

3.
Reload TWP.

It works great ! Thanks again for the help.

I attached "webremote.itcl" and "sendkey" file in case somebody would need them.

Mark.