Hi Jlao,
In theory, you should be able to use Control Points or Open Prices mode in MT4 simply by NOT launching via Tickstory. The Tickstory launch process suppresses the generation of the FXT files which are used for the actual back-test in the selected modelling type. In tick-mode, this allows the FXT file that Tickstory has generated to be used (as opposed to a sub-quality interpolation from the bar/HST information). If you bypass this step, MT4 should (in theory) generate the control points/open prices FXT file from the HST file that Tickstory generates as part of the export process. Of course, given that Tickstory is focused on tick-accuracy & the tick-based modelling type, you’ll have to try this out for yourself.
Here’s a good article on the various modelling types in MT4 that may also be useful: https://www.mql5.com/en/articles/1511.
Hope this helps.