import requests
import json
from StringIO import StringIO
import copy

#Script information, CONFIGURE
reportXid = "Your Report XID" #Report XID to add points to
removeExistingPoints = False #Remove the points that are already on the report
addDataSources = ["DS_1234"] #list of data source xids to add
additionalRQL = "limit(-1)" #use a high limit if not H2, or whatever limit is desired

#Server information, CONFIGURE
host = "192.168.1.111"
port = "80"
login = {"username": "admin", "password": "admin"}

#Begin script....
hostPort = host + ":" + port

s = requests.Session()
s.headers.update({'Cookie':'MANGO'+port+'=initial; XSRF-TOKEN=init','X-Xsrf-Token':'init','Accept': 'application/json', 'Accept-Encoding': 'gzip', 'Content-Type': 'application/json;charset=UTF-8'});

r = s.post('http://' + hostPort + "/rest/v2/login", data=json.dumps(login))

#del s.headers["Content-Type"]
del s.headers["Cookie"]
s.headers["X-Xsrf-Token"] = s.cookies["XSRF-TOKEN"]

#get the report's JSON:
reportsResponse = s.get('http://' + hostPort + "/rest/v2/json-emport?exportElements=reports")
#print reportsResponse.text
reportsList = json.load( StringIO( reportsResponse.text ))["reports"]
report = None
for rpt in reportsList :
	if rpt["xid"] == reportXid :
		report = rpt
		break
		
if report is None :
	print "Couldn't find report with xid: " + reportXid
	exit()
	
if removeExistingPoints :
	report.points = []
	
baseReportPoint = {
               "pointXid":"",
               "colour":"",
               "consolidatedChart":True,
               "plotType":1,
               "pointKey":"p",
               "weight":1.0
            }

if len(addDataSources) > 0 :
	dataPointsRql = "or("
	for dsXid in addDataSources :
		dataPointsRql += "eq(dataSourceXid," + dsXid + "),"
	dataPointsRql = dataPointsRql[:-1] + ")&" + additionalRQL
else :
	dataPointsRql = additionalRQL
	
#print dataPointsRql

def pointInReport(reportPoints, point) :
	for pnt in reportPoints :
		if pnt["pointXid"] == point["xid"] :
			return True
	return False

pointsResponse = s.get("http://" + hostPort + "/rest/v2/data-points?" + dataPointsRql)
#print pointsResponse.text
pointsList = json.load( StringIO( pointsResponse.text ))["items"]
for pnt in pointsList :
	#You may wish to configure the report points here as well
	if not pointInReport(report["points"], pnt) :
		newReportPoint = copy.deepcopy(baseReportPoint)
		newReportPoint["pointXid"] = pnt["xid"]
		newReportPoint["pointKey"] += str(pnt["id"])
		report["points"].append(newReportPoint)
		#print "Added point: " + pnt["xid"]

#Save the modified report through the json-emport
saveResponse = s.post("http://" + hostPort + "/rest/v2/json-emport", data=json.dumps({"reports":[report]}))
print "Saving report returned status: ", saveResponse

You probably need to change my print statements if you're using Python 3.

Edit: Fixed up the multiple data source possibility some

Thanks for the idea! I know internally we're talking about ways to unify the reporting, and I would definitely expect we'll consider this and put in some mechanisms resembling those in the Watchlist Builder.

One could do something like this with either a python script or a script inside of Mango. I can show you how, but admittedly it isn't as smooth as having a UI to do it from.