Instrument change should be able to apply to multimeasure rest
The most usual (I can't imagine any counter-examples) place to have an instrument change is at the start of a series or rests, so that the player has time to make the change. The current behaviour means that when one places an instrument change in its most logical position, say at the start of a period of 8 bars rest, if multimeasure rests are enabled MS insists on the instrument change being placed in a single bar rest, followed by a 7 bars multimeasure rest. It is impossible in such a case to have the instrument change at the start of an 8 bar multimeasure rest.
I suggest that instrument changes, like tempo text, should not force a break in multimeasure rests.
If there are counter examples where it makes sense to have a break, the user would be able to achieve this via the Bar Properties.