As someone who has played eve since jan 2004 I have always thought it stupid that caps are banned from high sec.

My personal preference would be to allow all capitals in high sec and allow cynos to be lit, however with a small limitation and that being the cyno pilot and capital pilot would need faction standings with the system faction to be able to do this.

0.5sec - faction status => +5.0 for capital pilot and cyno pilot
0.6sec - faction status => +6.0 for capital pilot and cyno pilot
0.7sec - faction status => +7.0 for capital pilot and cyno pilot
0.8sec - faction status => +8.0 for capital pilot and cyno pilot
0,9sec - faction status => +9.0 for capital pilot and cyno pilot
1.0sec - faction status => +10.0 for capital pilot and cyno pilot

example - to light a cyno or pilot a capital in jita both pilots would need 10.0 standings with the caldari faction
example - to light a cyno or pilot a capital in amarr both pilots would need 10.0 standings with caldari amarr faction

This would make use of faction standings, a reward for being a trusted citizen, whilst also keeping travel across high sec impossible. all capitals to be able to usae all jump gates with the same sec staus / standings as above.

As a sandbox, I think one of the previous comments is correct, if I want to mine in a titan in high sec I should be allowed to !! no I don't want to mine myself but as a sandbox in should be possible. or maybe ide like to wardec a corp and burn their pos down in the system I live in, or maybe i would like to give triage for my corp in a war or for a buddy to stop them getting suicide ganked!!. just a few examples and my 2cents on the subject.

maybe allow building as well with them same sec status and faction standings applied.

I know this will not ever get implemented as too many "elite" null sec pilots will complain with the same rhetoric "want to use the big toys join a aliiance", done that many times and into my 12 year of the game.