@mikef Heat does the opposite mate. In this instance, heat will increase resistance.
However the initial current required to get it moving, after overcoming static friction, will be less, hence why it may speed up.
Definitely the ampage will affect the cranking speed.
Yes mate I appreciate you want to keep the motor mint condition. Kick start won't devalue it, and can easily be reverted back should you wish to sell it.
Personally I like having the option to do both!