When it comes to games, weapons on models and anything that would normally be represented needs to be. Wargear that doesn't need to be represented can be varied.
If you go to the effort of making your weapons alterable, through magnets or whatever, you can make use of this flexibility. The conversion work and painting the extra guns is the price you pay.
Finally, while wargear can be changed, when it comes to the mini tournament we will each submit a list. That is what we play to for ALL games.
In other news, the pic above shows i've made a start on my winds of war penal legion... Which is REALLY not helping my tofg this month :-P