Tweaks.

Re-uses the too_many_active_drones() proc as originally intended.
Makes the private_valid_special_roles list global, no need to let each individual player initialize the list.

code/modules/client/preference_setup/antagonism/02_candidacy.dm

@@ -1,7 +1,8 @@
+var/list/private_valid_special_roles
+
 /datum/category_item/player_setup_item/antagonism/candidacy
 	name = "Candidacy"
 	sort_order = 2
-	var/list/private_valid_special_roles
 
 /datum/category_item/player_setup_item/antagonism/candidacy/load_character(var/savefile/S)
 	S["be_special"]	>> pref.be_special_role

code/modules/ghosttrap/trap.dm

@@ -48,6 +48,12 @@ var/list/ghost_traps
 
 // Print a message to all ghosts with the right prefs/lack of bans.
 /datum/ghosttrap/proc/request_player(var/mob/target, var/request_string, var/request_timeout)
+	if(request_timeout)
+		request_timeouts[target] = world.time + request_timeout
+		target.destruction.register(src, /datum/ghosttrap/proc/target_destroyed)
+	else
+		request_timeouts -= target
+
 	for(var/mob/dead/observer/O in player_list)
 		if(!O.MayRespawn())
 			continue
@@ -58,12 +64,6 @@ var/list/ghost_traps
 		if(pref_check && !(pref_check in O.client.prefs.be_special_role))
 			continue
 		if(O.client)
-			if(request_timeout)
-				request_timeouts[target] = world.time + request_timeout
-				target.destruction.register(src, /datum/ghosttrap/proc/target_destroyed)
-			else
-				request_timeouts -= target
-
 			O << "[request_string] <a href='?src=\ref[src];candidate=\ref[O];target=\ref[target]'>(Occupy)</a> ([ghost_follow_link(target, O)])"
 
 /datum/ghosttrap/proc/target_destroyed(var/destroyed_target)

code/modules/hydroponics/seed_mobs.dm

@@ -4,7 +4,7 @@
 	if(!host || !istype(host)) return
 
 	var/datum/ghosttrap/plant/P = get_ghost_trap("living plant")
-	P.request_player(host, "Someone is harvesting [display_name].")
+	P.request_player(host, "Someone is harvesting \a [display_name].")
 
 	spawn(75)
 		if(!host.ckey && !host.client)

code/modules/mob/living/living.dm

@@ -815,7 +815,7 @@ default behaviour is:
 		ear_deaf = deaf
 
 /mob/proc/can_be_possessed_by(var/mob/dead/observer/possessor)
-	return istype(possessor) && possessor.client  && possessor.ckey
+	return istype(possessor) && possessor.client
 
 /mob/living/can_be_possessed_by(var/mob/dead/observer/possessor)
 	if(!..())

code/modules/mob/living/silicon/robot/drone/drone.dm

@@ -65,6 +65,9 @@ var/list/mob_hat_cache = list()
 	if(!config.allow_drone_spawn)
 		src << "<span class='danger'>Playing as drones is not currently permitted.</span>"
 		return 0
+	if(too_many_active_drones())
+		src << "<span class='danger'>The maximum number of active drones has been reached..</span>"
+		return 0
 	if(jobban_isbanned(possessor,"Cyborg"))
 		usr << "<span class='danger'>You are banned from playing synthetics and cannot spawn as a drone.</span>"
 		return 0
@@ -299,7 +302,7 @@ var/list/mob_hat_cache = list()
 //Reboot procs.
 
 /mob/living/silicon/robot/drone/proc/request_player()
-	if(active_drones() >= config.max_maint_drones)
+	if(too_many_active_drones())
 		return
 	var/datum/ghosttrap/G = get_ghost_trap("maintenance drone")
 	G.request_player(src, "Someone is attempting to reboot a maintenance drone.", 30 SECONDS)
@@ -342,9 +345,9 @@ var/list/mob_hat_cache = list()
 	real_name = "construction drone ([rand(100,999)])"
 	name = real_name
 
-/proc/active_drones()
+/proc/too_many_active_drones()
 	var/drones = 0
 	for(var/mob/living/silicon/robot/drone/D in mob_list)
 		if(D.key && D.client)
 			drones++
-	return drones
+	return drones >= config.max_maint_drones