you still need to pay attention to the menu lines in the scripts - always at bottom.
suppose you have a road.rb (it's about time) and want to integrate it to menu.rb
you will have to analyse the menu portion in road.rb, if it looks 'portable' (trial & error for me) copy the code (usually starts with 'if' and ends with 'end'). to menu.rb
if you want to keep the plugins folder neat, you can place road.rb in the scripts folder, making sure the file location in menu.rb now looks like '**scripts/**road.rb'
you then place a hash (#) at the beginning of every line of code in road.rb. that will disable the code and ensure you shall not find the menu item appearing in 2 different places.
hope this is of help
EDIT: if anyone has a list of scripts (fee and free) please let me know - i can then carry some trimming in my menu and post it (too much stuff).
otherwise let me know which free plugin we should have as a must and i will write one new