[Billiam]

I have a plugin that slows players down via

SetEntDataFloat(client,FindSendPropInfo("CTFPlayer", "m_flMaxspeed"), <newspeed>);

This works great for all classes except sniper. When a sniper zooms back out, their speed is reset. Not sure how to fix this. Is there a 'zoomed back out' event?

[SAMURAI16]

you have to set that in PostThink (use DukeHacks : http://forums.alliedmods.net/showthread.php?t=69658)
Another way would be in a hook for OnActiveWeapon

CBaseCombatCharacter::OnChangeActiveWeapon(CBaseCombatWeapon*, CBaseCombatWeapon*)

But i don't know any extension having this feature

[CrimsonGT]

A weapon hook for OnChangeActiveWeapon wouldnt work, he would need one for when they zoom out which from my experience, none of them seem to get called at the right time anyways. Looks like theres not a zoom game event either, so probably the best you could do with just a sourcemod plugin is use the m_nPlayerCond netprop, and check ongameframe() if they are zoomed or not, and if they were on last frame and arent this frame reset their speed.

I tend to avoid OnGameFrame() like the plague though, but I am not sure pre/post clientthink is any better. (I use them because its a placebo effect at the very least, although I hope they are a little more efficient).

*Edit*

Alternatively, if there speed is ALWAYS supposed to be slowed, you could just set it in the CTX file for snipers. If you go with the m_nPlayerCond method, you can search the scripting forum for it, theres a few posts here that give the codes for a sniper being zoomed in, and how to check them and what not.