Add Igniter'n'things vendor to Security. Or just straight up more Securitrons.

[Studenterhue]

there's a vendomat in the same room as your lockers which produces those things which is presumably where you get the rest of the securitron components

According to the maps, that's only on Cog1. (and yes, I did not even notice that one, so thank you).

I think securitrons also need a robot arm to work.

You are correct. And if at all possible, a supply of them in the office would also be much appreciated.
Or just straight up securitrons.

i feel like you should still have to work to get robot arms and not just have 6 or so securitrons ready to build on a silver platter, additionally if you want more robotic security you could ask the rd to activate some of the sleeping buddies 
also the people talking about the "desks" and the "offices" it doesn't actually make you seem more official because we can't see you in there so it just gives the impression there isn't any security on the station

If you can't see a sec off sitting at the security window in the main sec office, it means you're blind. That's literally the "come here to talk with sec" window.

I think it means that in a more of "sec around, but inactive/braindead" not there rather than a "no sec officers" not there. Or maybe not. I don't know, maybe Newton actually does mean the latter. All I know is, that place is an okay place to go braindead since you can sit in the chair and make it like you're busy modifying the sec records (Personally, I'd do the cameras computer, since it's more isolated, but oh well.)