Thanks for the info will look at mixers and have cut the wire in case I forget later

OHHHHHHHHHHH before I forget if your intending to use BEC from one ESC please remember to disconnect the positive lead from the other ESC so you don't fry something

yes you can BUT if you buy a mixer you can have differential speed control to each motor. Any number of companies make them

http://www.cornwallmodelboats.co.uk/acatalog/mtroniks_wtail.html

is one example that should solve all your problems.