ALTDEV XING FUELR INTXN DURING APCH INTO LAX.

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AT ARNES FIX (ILAX D33.0) I CAPTURED THE GS BECAUSE EVERYTHING LOOKED GOOD (IE; RIGHT ON GS AT 33 DME; 10000 FT MSL). AFTER SUZZI (ILAX D29) THE ACFT NOSED OVER TO FOLLOW GS. I IMMEDIATELY 'UNCAPTURED' THE GS BY USING THE VERT SPD WHEEL SO AS TO NOT DSND BELOW 8000 FT UNTIL FUELR (ILAX D26.4). THE AUTOPLT RESPONDED SLOWER THAN I THOUGHT IT WOULD AND I WAS 200-300 FT LOW XING FUELR. REST OF FLT WAS UNEVENTFUL. IN THE FUTURE; I WILL NOT ALLOW CAPTURE OF GS UNTIL I'VE REACHED 2100 FT MSL (PRIOR TO LIMMA). CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS AWARE OF THE ALT RESTRS PLACED ALONG THE WAY OF THE ILS RWY 25L. HOWEVER; HIS TECHNIQUE OF AUTOPLT USE ALLOWED HIM TO DSND 300 FT LOW OVER FUELR. HE PLANS ON USING AN ENTIRELY DIFFERENT TECHNIQUE FOR GS INTERCEPTION IN THE FUTURE. HE SIMPLY WILL NOT ENGAGE THE FULL ILS TRACKING UNTIL PASSING THROUGH 2100 FT. THIS PLT FELT IT WOULD BE HELPFUL IF APCH CTL WOULD ANNOUNCE TO ACFT; WHEN CLRED FOR AN APCH; 'COMPLY WITH ALL XING ALTS.' THIS MEANS TO HIM; THAT WHEN CLRED FOR AN ILS; THE XING ALTS ARE STILL IN EFFECT.