[Riser]

Its maxed out at 2 atm, any idea how to increase it?

I've tried adding this for each map:
"extraspectators" "10"

No luck.

[Riser]

I did try that.

Typing "spectate" into console worked.. but what about from the teammenu(binded to M)? I don't see a spectate option.

[Riser]

haha, right now I use a plugin checks if a user selects Auto Assign, it'll move them to spectate instead of an actual team.

[VJScope]

We use advanced commands plugin and there's command sm_spec <player>. You can put extra spectators (you can see only 2 but it works). Well.. this is for admins only but it is possible.

[Riser]

I found this while starting up a local server:
sv_competitive_minspec

It's a locked cvar, I tried sm_cvar sv_competitive_minspec 5 and it still limited spectators to 2. Hopefully they introduce a cvar to control it in the next update.

[Visual77]

That cvar has nothing to do with spectators. I think it is a boolean cvar also which means it can only return true or false. (1/0)
From CSS patch notes:

Added a new server ConVar "sv_competitive_minspec" that enforces the following restrictions on clients when set to 1: r_drawdetailprops 1 r_staticprop_lod (-1 to 3) fps_max minimum 60 (or 0) cl_detailfade minimum 400 cl_detaildist minimum 1200 cl_interp (0 to 0.031) cl_interp_ratio (1 to 2)

And to be honest, there shouldn't even be cvars controlling how many spectators there can be. No other games has that, hopefully they'll just make spectating unlimited in the
next patch but I doubt they'll fix it that fast. Valve time

[Visual77]

A few days ago I was asked about were my spectate fix went.

To avoid any confusion, I removed my temporary fix some while ago due to valve adding the
"mp_spectators_max" convar. // Defualt is 2

From change log quite a while ago
- Added mp_spectators_max convar to control how many spectators are allowed in a match.

[Ade]

shouldn't this be the same as the number of player slots?

also, you can try to enable sourcetv