diff --git a/library/include/modules/Screen.h b/library/include/modules/Screen.h
index e29233170..10b6afb21 100644
--- a/library/include/modules/Screen.h
+++ b/library/include/modules/Screen.h
@@ -123,6 +123,9 @@ namespace DFHack
 
         static bool is_instance(df::viewscreen *screen);
 
+        virtual int8_t movies_okay() { return 1; }
+        virtual bool key_conflict(df::interface_key key);
+
         virtual bool is_lua_screen() { return false; }
         virtual std::string getFocusString() = 0;
     };
@@ -154,6 +157,5 @@ namespace DFHack
         virtual void help();
         virtual void resize(int w, int h);
         virtual void feed(std::set<df::interface_key> *keys);
-        virtual bool key_conflict(df::interface_key key);
     };
 }
diff --git a/library/modules/Screen.cpp b/library/modules/Screen.cpp
index 561ae2c5e..7dcbba322 100644
--- a/library/modules/Screen.cpp
+++ b/library/modules/Screen.cpp
@@ -269,6 +269,11 @@ bool dfhack_viewscreen::is_instance(df::viewscreen *screen)
     return dfhack_screens.count(screen) != 0;
 }
 
+bool dfhack_viewscreen::key_conflict(df::interface_key key)
+{
+    return key == interface_key::OPTIONS;
+}
+
 /*
  * Lua-backed viewscreen.
  */
@@ -516,8 +521,3 @@ void dfhack_lua_viewscreen::feed(std::set<df::interface_key> *keys)
     lua_pushlightuserdata(Lua::Core::State, keys);
     safe_call_lua(do_input, 1, 0);
 }
-
-bool dfhack_lua_viewscreen::key_conflict(df::interface_key key)
-{
-    return key == interface_key::MOVIES || key == interface_key::OPTIONS;
-}
diff --git a/plugins/manipulator.cpp b/plugins/manipulator.cpp
index 5179b0132..deb45b9d9 100644
--- a/plugins/manipulator.cpp
+++ b/plugins/manipulator.cpp
@@ -36,7 +36,7 @@ using df::global::enabler;
 
 typedef struct
 {
-	char *name;
+	const char *name;
 	int points;
 	char abbrev;
 } SkillLevel;
@@ -241,7 +241,7 @@ DFHACK_PLUGIN("manipulator");
 #define    FILTER_LIVING        0x0010
 #define    FILTER_DEAD        0x0020
 
-class viewscreen_unitlaborsst : public df::viewscreen {
+class viewscreen_unitlaborsst : public dfhack_viewscreen {
 public:
     static viewscreen_unitlaborsst *create (char pushtype, df::viewscreen *scr = NULL);
 
@@ -251,12 +251,11 @@ public:
     void resize(int w, int h) { calcSize(); }
 
     void help() { }
-    int8_t movies_okay() { return 1; }
-    int8_t is_option_screen() { return 0; }
-    int8_t is_save_screen() { return 0; }
+
+    std::string getFocusString() { return "unitlabors"; }
+
     viewscreen_unitlaborsst();
     ~viewscreen_unitlaborsst() { };
-    bool key_conflict(df::interface_key test_key) { return test_key == interface_key::OPTIONS; }
 
 protected:
     vector<df::unit *> units;
@@ -577,11 +576,7 @@ void viewscreen_unitlaborsst::render()
                 str += ENUM_ATTR_STR(job_skill, caption_noun, columns[sel_column].skill);
                 if (level != NUM_SKILL_LEVELS - 1)
                 {
-                    str += " (";
-                    str += itoa(skill->experience, buf, 10);
-                    str += "/";
-                    str += itoa(skill_levels[level].points, buf, 10);
-                    str += ")";
+                    str += stl_sprintf(" (%d/%d)", skill->experience, skill_levels[level].points);
                 }
             }
             else