This returns a list of all subscriptions in an instance, their SQL Agent Job IDs and built commands for Starting, enabling & disabling jobs.

SSRS_Subscription_Jobs

USE ReportServer

SELECT 
	cat.Name,
	cat.Path,
	sch.ScheduleID AS AgentJobID,
	sch.LastRunTime,
	'EXEC msdb.dbo.sp_start_job N''' + CAST(sch.ScheduleID as nvarchar(36)) + ''' ;' AS StartJob,
	'EXEC msdb.dbo.sp_update_job @job_name = N' + CAST(sch.ScheduleID as nvarchar(36)) + ', @enabled = 1 ;' AS EnableJob,
	'EXEC msdb.dbo.sp_update_job @job_name = N' + CAST(sch.ScheduleID as nvarchar(36)) + ', @enabled = 0 ;' AS DisableJob
FROM
	dbo.Schedule sch
INNER JOIN
	dbo.ReportSchedule rsch
ON sch.ScheduleID = rsch.ScheduleID
INNER JOIN
	dbo.Catalog cat
ON rsch.ReportID = cat.ItemID