So basically you just break down your units into whatever size you want? That seems like it would be either abuseable or without purpose. Either your army has a reason to leave everyone in a single unit (buffs, orders, etc.), or else you'd just split up your forces into one-man squads to improve your versatility, avoid overkilling enemy targets, force your opponent to multi-assault etc.
That said, you might take a look at Heralds of Ruin. I hear good things and, as someone who also enjoys small-scale
40k systems, intend to look into it soon myself.