To move measures limits

[Wills01]

Reaper offers several solutions to synchronize time line with a midi or an audio track. But I think the best one could be the following one.

It could be good to introduce the possibility to move measures limits with the mouse. With this feature, We easily adjust the measure lenght and limits synchronized with a midi track or with transient values of an audio track. After this process, Reaper will convert the variable timeline in a regular one introducing tempo changes...

[inthevoid]

You can do this already. Just put a tempo / timesig marker at the start of a measure. Then hold ctrl - drag it. It’ll move the measure line adjusting the previous tempo. You can change the behaviour in mouse modifiers