As IA says in the export_descr_character_traits.txt file in the SS6.3/data folder you can amend the following values:
(these are the changed values)
Code:
;------------------------------------------
Trait OldMerchant
Characters merchant
Level Old_Merchant
Description Old_Merchant_desc
EffectsDescription Old_Merchant_1_effects_desc
Threshold 1
Effect MovementPoints -4
Level Old_Merchant
Description Old_Merchant_desc
EffectsDescription Old_Merchant_2_effects_desc
Threshold 6
Effect MovementPoints -6
Level Old_Merchant
Description Old_Merchant_desc
EffectsDescription Old_Merchant_3_effects_desc
Threshold 11
Effect MovementPoints -8
Level Old_Merchant
Description Old_Merchant_desc
EffectsDescription Old_Merchant_4_effects_desc
Threshold 16
Effect MovementPoints -10
Level Old_Merchant
Description Old_Merchant_desc
EffectsDescription Old_Merchant_5_effects_desc
Threshold 21
Effect MovementPoints -12
Level Old_Merchant
Description Old_Merchant_desc
EffectsDescription Old_Merchant_6_effects_desc
Threshold 26
Effect MovementPoints -14
-------------------------------------------------------
and possibly:
(to allow slave merchants normal movement)
nb - the bit in spoilers merely places a semi-colon ; in front of each line to comment it out so the prog does not read it.
make a back up of the original file before doing any changes.
start a new campaign to avoid messing up your existing games.