Is nicotine in itself dangerous in any way? do people with temporal lobe epilepsy or other neurological disorders tend to crave it?

Nicotine Addiction: Nope. Without first being exposed to nicotine no human craves it naturally.

Unhealthy: Not "dangerous" but considered unhealthy - nicotine promotes atherosclerosis and slows down wound healing etc. Regarding craving, many people like it (not particular to epilepsy). A remarkable chemical - perks one up and calms the nerves at the same time. Most stimulants cause jitters, most relaxants cause sedation, while nicotine combines excitation and relaxation with few side effects.