We all shouldn't have to be friggin hackers...
let us take out the knife and free grenades if we want. (I think you get a grenade no matter what too) We can look at our beautifully modeled empty pistol if we run out of ammo. (if we survived long enough to run out of ammo, we can probably pick up a gun) We Die-Hard purists don't want frag grenades and a knife in our Bruce Willis Barretta loadout, heheh.
And dare I say it, but CS's numbering system is GREAT. It works simply and efficiently. A guy suggested using it above, and I have to full heartedly support him. Primary #1, pistol #2, nades #3, knife (if you have it) #4.
This is great for 2 reasons for INF:
I think alot of us use the WSADQE keys (forward, back, L/R, lean L/R) and the needed number keys are directly above (conveniant). If you don't use those keys you probably would benefit if you did.
And the second reason: changing your loadouts between rounds leads to confusion if you don't know what # your primary weapon is. and using the wheel takes you through grenade, knife, and pistol. slow. bad. The number keys are hella lot cleaner to use.