I have had to work at one of our other offices in the past, and in order to overcome the temporary-ness, I had a routine that would renable the flash drive support, then I would just plug in my flash drive and run customizations from there.
Here at my office, all the customization in one folder. All I have to do is add the main path to the top of the list, and that causes the acaddoc.lsp to load, which loads everything, I have programs that load custom menus, other programs, tool palettes, etc. And on top of all that, every one of the custom routines I use are encrypted and have a security check to see if a particular file exists in a particular location, if not, none of the programs run. (the only disadvantage to this is if your flash drive keeps changing drive letters from computer to computer.