Tactical shield manipulation 4 is super duper important for shield tank, dont train it to 5 as that can actually make your tank worse ( in theory ) and has no benefits.

Energy grid upgrades, need this one to 5 if you want to fly heavy assault ships but if thats not something you are looking to do in the first year ( due to them being sorta underwhelming with t3 cruisers around, this goes double for multiboxers although ishtar is nice for pve ( gila better for WH ) )

Electronic upgrades, need this to atleast 4, 5 if you want to fly recons/covert ops ( which arent used for multiboxing apart from stealth bomber fleet )

Remote shield/armor transfer/repair to 4, for spider tank setups/logi pilots

Navigation skills, these use int/per remap which you shouldnt ever do, int/memory being the next best thing so train these while you are in your int/mem remap. These would be Evasive maneuvering, warp drive operation, acceleration control, afterburner and high speed maneuvering to 4 ( 5 optional, just make sure all toons have the same levels of these to make navigation easier ) and navigation to 5.

Science 5 isnt really needed since its rank 1 skill and only used for capital skills and RnD.

Target management 5, advanced target management 4.

Add that to the skill queue and you have everything you will ever need to train with a int/mem remap :-)