The only "control" for the main wheels on any Van's RV is though braking and/or differential braking.
Is it enough to hold it straight running during the takeoff?
No, it's not. You will need to hold the appropriate rudder to keep it center line -- it's not a hard skill to learn but there is considerable torque during the takeoff roll and it can absolutely catch you off guard if you aren't prepared for or expecting it.
Thanks, sound like a class I should take. Any good link for more info?
Most of us take some kind of transition training. I'm not sure what you'll have available in Israel but if you find yourself in the states there are a lot of options.
I like Mike Seagar, he's in Oregon near the Vans Aircraft factory. Cost is about $1200 or so and you will have a fun time learning how to fly and about RVs.
Sounds good.