Add parameter for score boost value

specs/phase0/fork-choice.md

@@ -8,6 +8,7 @@
 - [Introduction](#introduction)
 - [Fork choice](#fork-choice)
   - [Preset](#preset)
+  - [Configuration](#configuration)
   - [Helpers](#helpers)
     - [`LatestMessage`](#latestmessage)
     - [`Store`](#store)
@@ -63,6 +64,12 @@ Any of the above handlers that trigger an unhandled exception (e.g. a failed ass
 | `SAFE_SLOTS_TO_UPDATE_JUSTIFIED` | `2**3` (= 8) | slots | 96 seconds |
 | `ATTESTATION_OFFSET_QUOTIENT` | `3` | - | - |
 
+### Configuration
+
+| Name | Value |
+| - | - |
+| `PROPOSER_SCORE_BOOST_QUOTIENT` | `4` |
+
 ### Helpers
 
 #### `LatestMessage`
@@ -174,7 +181,7 @@ def get_latest_attesting_balance(store: Store, root: Root) -> Gwei:
             block_epoch = compute_epoch_at_slot(block_slot)
             committee_size = get_committee_count_per_slot(state, block_epoch) * TARGET_COMMITTEE_SIZE
             committee_weight = committee_size * avg_balance
-            proposer_score = committee_weight // 4
+            proposer_score = committee_weight // PROPOSER_SCORE_BOOST_QUOTIENT
     return attestation_score + proposer_score
 
 ```