This type of charging has been mentioned fairly often on this forum and others. Yes its cheesy, but its totally within the rules.
Seriously ?? Cheesy? it is a tactical consideration previous to setting up your charge. It is also something only profiting Infantry units, as they are the only ones that will benefit from being able to maintain support!
Both players are allowed to Mb4M, and I need to find a player yet that wont fiddle about with his placement to optimize his set-up (myself included).
IMO there is little cheese on the platter of WM, there are some weird and wonderful tactical considerations (the Trollslayer BBQ wagon for one, and irregular placement of artillery guards), but their perceived "bonus" is always negated by a malus
being privy to design discussions with Rick, this is not a flaw in the rules but an intentional consideration to force people to think about their battle plans.
Remember the original intention for WM(f) was to model the fast & furious fantasy style combat that is WHFB

in a way that it actually looks like massed clashes on the battlefield.
Read the intro into WM(a) where the intention is to create more "realistic" model that would appease historical gamers also.