Index: trunk/src_plugins/drc_query/drc_query.conf
===================================================================
--- trunk/src_plugins/drc_query/drc_query.conf	(revision 30202)
+++ trunk/src_plugins/drc_query/drc_query.conf	(revision 30203)
@@ -3,6 +3,20 @@
 		ha:plugins {
 			ha:drc_query {
 				disable=0
+
+				li:definitions {
+					ha:min_drill {
+						type = coord
+						legacy = design/min_drill
+						desc = {minimum drill diameter}
+					}
+					ha:hole_overlap_factor {
+						type = real
+						default = 0.0
+						desc = {How much drilled holes may overlap [-1..+1]; 0 means touching holes are reported; positive numbers allow more overlap, negative numbers report non-overlapping but close holes}
+					}
+				}
+
 				li:rules {
 
 					ha:hole_dia {
@@ -9,7 +23,7 @@
 						type = single hole
 						title = hole too small
 						desc = padstack hole diameter is too small
-						query = {(@.hole > 0) && (@.hole < 0.2mm)}
+						query = {(@.hole > 0) && (@.hole < $min_drill)}
 					}
 
 					ha:hole_overlap {
@@ -21,7 +35,7 @@
 							rule overlap
 							let A @.type==PSTK
 							let B A
-							assert (A.ID > B.ID) && (distance(A.x, A.y, B.x, B.y) < (A.hole + B.hole)/2) thus mklist(A, B)
+							assert (A.ID > B.ID) && (distance(A.x, A.y, B.x, B.y) < (A.hole + B.hole)/(2*(1+$hole_overlap_factor))) thus mklist(A, B)
 						}
 					}
 
@@ -34,7 +48,7 @@
 							rule net brk
 							let N netlist()
 							let O netsegs(N)
-							assert netbreak(O, 9mil)
+							assert netbreak(O, $min_copper_overlap)
 						}
 					}
 
@@ -47,7 +61,7 @@
 							rule net short
 							let N netlist()
 							let O netsegs(N)
-							assert netshort(O, 12mil)
+							assert netshort(O, $min_copper_clearance)
 						}
 					}
 
Index: trunk/src_plugins/drc_query/drc_query_conf.h
===================================================================
--- trunk/src_plugins/drc_query/drc_query_conf.h	(revision 30202)
+++ trunk/src_plugins/drc_query/drc_query_conf.h	(revision 30203)
@@ -6,7 +6,8 @@
 typedef struct {
 	const struct {
 		const struct {
-			CFT_BOOLEAN disable;        /* disable the whole engine */
+			CFT_BOOLEAN disable;     /* disable the whole engine */
+			CFT_HLIST definitions;   /* DRC constant definitions */
 			CFT_HLIST rules;         /* inline rules */
 		} drc_query;
 	} plugins;