Today, when you install Marketo Sales Insight with Salesforce, the managed package automatically creates the required fields for syncing over a variety of items, such as those around Last Interesting Moment. In particular, Last Interesting Moment Description is a textarea field--but it is limited to 255 characters. Marketo does not enforce any sort of field length limit beyond its maximum on the backend. As a result, it is exceedingly common to create Interesting Moment Descriptions that exceed 255 characters, especially if something like trigger URL is being replicated on an IM like "Clicked Important Email". My current understanding is that these fields are NOT directly referenced in the Visualforce components of MSI and thus there would be minimal impact to accepting larger items. For example, when looking at a MSI Visualforce component on a client instance, I can see a description of 285 characters is successfully displayed. As a result, I would like the ability to optionally increase the textarea field character limit within reason to accommodate these behaviors without encountering sync issues. You should be able to modify this in a straightforward way in the package schema by changing the field's manageableState to SubscriberControlled.
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