I think there is an app called MyMenu which can do this.

right, being mr.impatient and curious i started messing about myself.

this gets all installed apps;
then, in the 'layout' section i add the folders i want using "<menuname>" and the name of the menu i want;
then, it dumps all shortcuts beneath it.

hildon.menu
then, for the added menu i made a new file in the /etc/xdg/menus/hildon directory called 'Grimm.menu'
with the following code:

"<name>" must match the "<menuname>" from the 'hildon.menu' file.
in the "<Include>" section you add the names of the '.desktop' files you want that that specific menu.
"<directory>" is the link to the directory file in /usr/share/applications/hildon with the code:
where "Name" is the name of the folder shown in the 'main' menu.
using "X-Osso-User-Position=" you can possition the folder where you want it, know that everything without a number gets added underneath all the things with a number.
this currently being my only one with a number, eventhough its 14, its still at the top.

if you want to add another folder just make another '.menu' and '.directory' and add the name to the 'include' list in 'hildon.menu'

does this help anyone? anything i could/should change to make it better?