The command for strafing

As you said,by default you should be able to vote maps with number keys(1-8).

In game those keys are used to select your weapons,and as such can be binded to other keys.

So if you change the number 1(primary weapon) to lets say letter K...If you wanted to vote for the first map you will have to press K,pressing 1 wouldn't give your vote.

This is the default binding,if you want to vote maps with numbers 1-8 you should bind it correspondingly.

Assuming this is your question: Is there any way to have infinite armor (Kevlar and helmet)? Then no. Depending on what you want to achieve, commands you might want to look into are:

Gives free armor to you and the bots (a map command): mp_free_armor 1

Gives you free kevlar and helmet: give weapon_vesthelm

Makes regeneration very rapid/makes you invulnerable: sv_regeneration_force_on 1