He is okay for the walking. If he is not holding on to stuff and walking around that way he needs to see the doc.
My 5 yr old still sits in a high chair anytime we go to McDonalds, Burger King, a restaurant of any kind because he will get up and take off, he is a runner and will make life hell of left to his own freedom. I choose to put him there so that if he starts to run I can hold on to him and redirect him.
A toddler usually will not have the fine motor skills to hold a crayon unless it is a really fat one and they won't be able to draw or write anything, they may be able to color but not stay in the lines or recognize that is desirable. it is beyond their capabilities.
A 2 yr. old still is moving their hand from the upper arm or elbow area, not having the fine motor skills to actually make legible markings. Tracing letters and shaped is a good activity at this age. We din't even have craft tables in my 2 yr. old classrooms. They had their lunch table and they used it some but the kids were not ever very interested. Puzzles and finger painting is fun at this age. Very basic and beginning sitting to do activities.
A 3 year old can old a marker or crayon a lot better and start to use their wrist for hand movement. As they get closer to 4 they should have the ability to start writing letters, tracing letters, much more ability.
As a child develops their fine motor skills they will start to feed themselves better if the food is appropriate. Finger foods are easy for a toddler to pick up and feed themselves. Spaghetti is nearly impossible for them to do with out using fingers. Same with any food they can't pick up and eat like a nugget or fish stick.
Until a full age 3 and they don't put stuff in their mouths anymore is a good rule of thumb.
Kids who are still putting stuff in their mouth should be considered to not be choke safe. If it fits through a toilet paper center roll it is too small for a child to have access to. In my child care center the parents were often upset I would take away hot wheels cars. They don't even touch the sides of a toilet paper roll. They are one of the most dangerous choke hazards in a play room. Lego's are next. Sand and other items they can eat are things I would not let them be around without total supervision. At our local park the kids often find needles, razor blades, cigarette butts with only God knows on them, etc...I don't let the kids play in the sand at any parks. I know, I stink at this job.
Kids need a parent to be smart and protect them. Kids love small objects but they are not safe for little ones.