This IceWM patch changes window move/size behaviour:
* KP_Begin (the [5] key on the keypad) centers the window on screen when moving
* Shift + cursor keys increase move/size speed 4 times (unchanged by this patch)
* Ctrl + cursor keys increase move/size speed 16 times
* Ctrl + Shift + cursor keys increase move/size speed 64 times

Marius Gedminas
marius@gedmin.as
http://gedmin.as/icewm/

diff -u ./src/movesize.cc.orig ./src/movesize.cc
--- ./src/movesize.cc.orig	Sat Dec 18 18:50:14 1999
+++ ./src/movesize.cc	Fri Jun 23 19:32:57 2000
@@ -202,9 +202,12 @@
     int m = KEY_MODMASK(key.state);
     int factor = 1;
 
-    if (m == ShiftMask)
+    if (m & ShiftMask)
         factor = 4;
 
+    if (m & ControlMask)
+        factor *= 16;
+
     if (k == XK_Left || k == XK_KP_Left)
         newX -= factor;
     else if (k == XK_Right || k == XK_KP_Right)
@@ -221,6 +224,11 @@
         newY = manager->minY(getLayer()) - borderY();
     else if (k == XK_Next || k == XK_KP_Next)
         newY = manager->maxY(getLayer()) - height() + borderY();
+    else if (k == XK_KP_Begin)
+    {
+        newX = (manager->minX(getLayer()) + manager->maxX(getLayer()) - (int)width()) / 2;
+        newY = (manager->minY(getLayer()) + manager->maxY(getLayer()) - (int)height()) / 2;
+    }
     else if (k == XK_Return || k == XK_KP_Enter)
         return -1;
     else if (k ==  XK_Escape) {
@@ -240,8 +248,11 @@
     int m = KEY_MODMASK(key.state);
     int factor = 1;
 
-    if (m == ShiftMask)
+    if (m & ShiftMask)
         factor = 4;
+
+    if (m & ControlMask)
+        factor *= 16;
 
     if (k == XK_Left || k == XK_KP_Left) {
         if (grabX == 0) {