cannot pass menu?

[NiKiZe]

If you want to have a separate keypress before loading the menu you can use the prompt command: http://ipxe.org/cmd/prompt

otherwise if you want to start with the prompt, you can always load a menu with chain, example chain http://server/menu.ipxe
another alternative is to use a menu with only 2 choices, one being default with a timeout that exits - the other loads the full menu.

If you are comparing to pxelinux, can you post an pxelinux example of what you want to achieve?
Loading pxelinux from ipxe is possible - but it have its own set of issues.