Commit for the 4 aforementioned "features":

 - "Global Pivot": Maintains a global Pivot and Align mode setting for
   all 3d views when enabled, instead of seperate settings per 3d view

 - "Auto Perspective": Switch to ortho mode automatically on 1/3/7, and
   to Perspective when the view is rotated with the mouse

 - "Align mode": As suggested on the list, when enabled, transformations
   on several objects only transform their locations, not their sizes or
   rotations.

 - Grid dotted when not 1:1

***ATTENTION***! The User Interface parts of these features have not been
committed, as I work on my own modified UI here. The three features need
toggle buttons to turn them on and off.

I used the following 3 buttons (first two features are in userprefs,
third as a 3d view setting):

        uiDefButBitS(block, TOG, USER_AUTOPERSP, B_DRAWINFO, "Auto Persp",
            (xpos+edgespace+(3*medprefbut)+(3*midspace)+smallprefbut+2),y3+10,smallprefbut,buth,
            &(U.uiflag), 0, 0, 0, 0,
            "Automatically switch between orthographic and perspective");

        uiDefButBitS(block, TOG, USER_LOCKAROUND, B_DRAWINFO, "Global Pivot",
            (xpos+edgespace+(4*midspace)+(4*medprefbut)),y3+10,smallprefbut,buth,
            &(U.uiflag), 0, 0, 0, 0,
            "Use global pivot setting for all 3d views");

    uiDefIconButS(block, TOG|BIT|10, B_AROUND, ICON_ALIGN,
                xco+=XIC,0,XIC,YIC,
                &G.vd->flag, 0, 0, 0, 0, "Translate only (align)");

Someone needs to add these to the interface in an appropriate manner!

Thanks.

1 files changed, 13 insertions, 6 deletions

diff --git a/source/blender/src/toets.c b/source/blender/src/toets.c
index 1e41d6b0024..75b4b70adcc 100644
--- a/source/blender/src/toets.c
+++ b/source/blender/src/toets.c
@@ -59,6 +59,7 @@
 #include "DNA_screen_types.h"
 #include "DNA_space_types.h"
 #include "DNA_view3d_types.h"
+#include "DNA_userdef_types.h"
 
 #include "BKE_utildefines.h"
 #include "BKE_global.h"
@@ -273,7 +274,8 @@ void persptoetsen(unsigned short event)
 			G.vd->viewquat[2]= 0.0;
 			G.vd->viewquat[3]= 0.0;
 			G.vd->view= 7;
-			if(G.vd->persp>=2) G.vd->persp= perspo;
+			if (U.uiflag & USER_AUTOPERSP) G.vd->persp= 0; 
+			else if(G.vd->persp>=2) G.vd->persp= perspo;
 		}
 		else if(event==PAD1) {
 			G.vd->viewquat[0]= 0.0;
@@ -281,7 +283,8 @@ void persptoetsen(unsigned short event)
 			G.vd->viewquat[2]= (float)-cos(M_PI/4.0);
 			G.vd->viewquat[3]= (float)-cos(M_PI/4.0);
 			G.vd->view=1;
-			if(G.vd->persp>=2) G.vd->persp= perspo;
+			if (U.uiflag & USER_AUTOPERSP) G.vd->persp= 0;
+			else if(G.vd->persp>=2) G.vd->persp= perspo;
 		}
 		else if(event==PAD3) {
 			G.vd->viewquat[0]= 0.5;
@@ -289,7 +292,8 @@ void persptoetsen(unsigned short event)
 			G.vd->viewquat[2]= 0.5;
 			G.vd->viewquat[3]= 0.5;
 			G.vd->view=3;
-			if(G.vd->persp>=2) G.vd->persp= perspo;
+			if (U.uiflag & USER_AUTOPERSP) G.vd->persp= 0;
+			else if(G.vd->persp>=2) G.vd->persp= perspo;
 		}
 		else if(event==PADMINUS) {
 			/* this min and max is also in viewmove() */
@@ -327,7 +331,8 @@ void persptoetsen(unsigned short event)
 			G.vd->viewquat[2]= 0.0;
 			G.vd->viewquat[3]= 0.0;
 			G.vd->view=7;
-			if(G.vd->persp>=2) G.vd->persp= perspo;
+			if (U.uiflag & USER_AUTOPERSP) G.vd->persp= 0;
+			else if(G.vd->persp>=2) G.vd->persp= perspo;
 		}
 		else if(event==PAD1) {
 			G.vd->viewquat[0]= (float)cos(M_PI/4.0);
@@ -335,7 +340,8 @@ void persptoetsen(unsigned short event)
 			G.vd->viewquat[2]= 0.0;
 			G.vd->viewquat[3]= 0.0;
 			G.vd->view=1;
-			if(G.vd->persp>=2) G.vd->persp= perspo;
+			if (U.uiflag & USER_AUTOPERSP) G.vd->persp= 0;
+			else if(G.vd->persp>=2) G.vd->persp= perspo;
 		}
 		else if(event==PAD3) {
 			G.vd->viewquat[0]= 0.5;
@@ -343,7 +349,8 @@ void persptoetsen(unsigned short event)
 			G.vd->viewquat[2]= -0.5;
 			G.vd->viewquat[3]= -0.5;
 			G.vd->view=3;
-			if(G.vd->persp>=2) G.vd->persp= perspo;
+			if (U.uiflag & USER_AUTOPERSP) G.vd->persp= 0;
+			else if(G.vd->persp>=2) G.vd->persp= perspo;
 		}
 		else if(event==PADMINUS) {
 			/* this min and max is also in viewmove() */