To reprice it if it moves 'X' ticks away
On the lay bet rule use the stored value tab and store the price the lay bet is placed at (with a name of your choice)
then further down that window use the Adjustment option and minus 'X' ticks (X being the number of ticks you want to let the price move against your opening lay bet
Then add a 'close trade on selection with greening' rule with a 'Stored Value Condition'
to test the back price is less than the stored value named (whatever you called it above)
To reprice it after a period of time
Add a 'Set/Modify Signal rule' and use the signal tab tab and set a signal on the selection (with a name of your choice)
then add a 'Unmatched Bets Amount Condition' to test the amount of unmatched bets backs is greater than £0
Then add a 'close trade on selection with greening' rule with a 'Signal Changed Condition'
to test the signal named (whatever you called it above)
changed between 10 - 20 secs ago
(10 being the amount of time you want it to be since the unmatched back bet was in the market and set the signal)
20 being incase you want the rule to re-trigger a few times in case not matched, ie, a 10sec window will allow you to trigger the rule 3 times rearming every 4 secs)