Cheating is the use of a program/cvar/setting/bind that gives you an unfair advantage.
You wont get banned at all, for maxpackets or fps commands. Just, some Servers have different settings, where Admins put max fps settings allowed, so people can't do certain jumps etc.
So, nope that isn't cheating. Pretty self explanatary, any tweaks are allowed (to improve performance), cheat commands are ones that improve accuracy, anti-recoil, aim, speed, vision etc.
/com_maxfps ???
/cl_maxpackets ??
/cg_drawfps 1
^ Handy commands.